diff --git a/CMakeLists.txt b/CMakeLists.txt
index cbb0e2ec49..9b8a1c8480 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,13 +13,13 @@ if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
 endif()
 
 if(DEFINED ENV{SLIC3R_STATIC})
-	set(SLIC3R_STATIC_INITIAL $ENV{SLIC3R_STATIC})
+        set(SLIC3R_STATIC_INITIAL $ENV{SLIC3R_STATIC})
 else()
-	if (MSVC OR MINGW OR APPLE)
-		set(SLIC3R_STATIC_INITIAL 1)
-	else()
-		set(SLIC3R_STATIC_INITIAL 0)
-	endif()
+        if (MSVC OR MINGW OR APPLE)
+                set(SLIC3R_STATIC_INITIAL 1)
+        else()
+                set(SLIC3R_STATIC_INITIAL 0)
+        endif()
 endif()
 
 option(SLIC3R_STATIC 			"Compile PrusaSlicer with static libraries (Boost, TBB, glew)" ${SLIC3R_STATIC_INITIAL})
@@ -52,9 +52,21 @@ if (SLIC3R_GUI)
     add_definitions(-DSLIC3R_GUI)
 endif ()
 
+if (MSVC AND CMAKE_CXX_COMPILER_ID STREQUAL Clang)
+    set(IS_CLANG_CL TRUE)
+
+    # clang-cl can interpret SYSTEM header paths if -imsvc is used
+    set(CMAKE_INCLUDE_SYSTEM_FLAG_CXX "-imsvc")
+
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall \
+        -Wno-old-style-cast -Wno-reserved-id-macro -Wno-c++98-compat-pedantic")
+else ()
+    set(IS_CLANG_CL FALSE)
+endif ()
+
 if (MSVC)
-    if (SLIC3R_MSVC_COMPILE_PARALLEL)
-	   add_compile_options(/MP)
+    if (SLIC3R_MSVC_COMPILE_PARALLEL AND NOT IS_CLANG_CL)
+           add_compile_options(/MP)
     endif ()
     # /bigobj (Increase Number of Sections in .Obj file)
     # error C3859: virtual memory range for PCH exceeded; please recompile with a command line option of '-Zm90' or greater
@@ -62,6 +74,10 @@ if (MSVC)
     add_compile_options(-bigobj -Zm520 /Zi)
 endif ()
 
+if (MINGW)
+    add_compile_options(-Wa,-mbig-obj)
+endif ()
+
 # Display and check CMAKE_PREFIX_PATH
 message(STATUS "SLIC3R_STATIC: ${SLIC3R_STATIC}")
 if (NOT "${CMAKE_PREFIX_PATH}" STREQUAL "")
@@ -101,17 +117,17 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 # WIN10SDK_PATH is used to point CMake to the WIN10 SDK installation directory.
 # We pick it from environment if it is not defined in another way
 if(WIN32)
-	if(NOT DEFINED WIN10SDK_PATH)
-		if(DEFINED ENV{WIN10SDK_PATH})
-			set(WIN10SDK_PATH "$ENV{WIN10SDK_PATH}")
-		endif()
-	endif()
-	if(DEFINED WIN10SDK_PATH AND NOT EXISTS "${WIN10SDK_PATH}/include/winrt/windows.graphics.printing3d.h")
-		message("WIN10SDK_PATH is invalid: ${WIN10SDK_PATH}")
-		message("${WIN10SDK_PATH}/include/winrt/windows.graphics.printing3d.h was not found")
-		message("STL fixing by the Netfabb service will not be compiled")
-		unset(WIN10SDK_PATH)
-	endif()
+        if(NOT DEFINED WIN10SDK_PATH)
+                if(DEFINED ENV{WIN10SDK_PATH})
+                        set(WIN10SDK_PATH "$ENV{WIN10SDK_PATH}")
+                endif()
+        endif()
+        if(DEFINED WIN10SDK_PATH AND NOT EXISTS "${WIN10SDK_PATH}/include/winrt/windows.graphics.printing3d.h")
+                message("WIN10SDK_PATH is invalid: ${WIN10SDK_PATH}")
+                message("${WIN10SDK_PATH}/include/winrt/windows.graphics.printing3d.h was not found")
+                message("STL fixing by the Netfabb service will not be compiled")
+                unset(WIN10SDK_PATH)
+        endif()
     if(WIN10SDK_PATH)
         message("Building with Win10 Netfabb STL fixing service support")
         add_definitions(-DHAS_WIN10SDK)
@@ -148,8 +164,10 @@ if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUXX)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fext-numeric-literals" )
 endif()
 
-if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall" )
+if (NOT MSVC AND ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang"))
+    if (NOT MINGW)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall" )
+    endif ()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-reorder" )
 
     # On GCC and Clang, no return from a non-void function is a warning only. Here, we make it an error.
@@ -168,7 +186,6 @@ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATC
         add_compile_options(-Wno-unknown-pragmas)
     endif()
 
-
     if (SLIC3R_ASAN)
         add_compile_options(-fsanitize=address -fno-omit-frame-pointer)
         set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address")
@@ -196,9 +213,12 @@ include_directories(${LIBDIR_BIN}/platform)
 include_directories(${LIBDIR}/clipper ${LIBDIR}/polypartition)
 
 if(WIN32)
-    # BOOST_ALL_NO_LIB: Avoid the automatic linking of Boost libraries on Windows. Rather rely on explicit linking.
-    add_definitions(-D_USE_MATH_DEFINES -D_WIN32 -DBOOST_ALL_NO_LIB -DBOOST_USE_WINAPI_VERSION=0x601 -D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_WARNINGS)
-endif()
+    add_definitions(-D_USE_MATH_DEFINES -D_WIN32 -D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_WARNINGS)
+    if(MSVC)
+        # BOOST_ALL_NO_LIB: Avoid the automatic linking of Boost libraries on Windows. Rather rely on explicit linking.
+        add_definitions(-DBOOST_ALL_NO_LIB -DBOOST_USE_WINAPI_VERSION=0x601 )
+    endif(MSVC)
+endif(WIN32)
 
 add_definitions(-DwxUSE_UNICODE -D_UNICODE -DUNICODE -DWXINTL_NO_GETTEXT_MACRO)
 
@@ -229,7 +249,7 @@ if(SLIC3R_STATIC)
     # set(Boost_USE_STATIC_RUNTIME ON)
 endif()
 #set(Boost_DEBUG ON)
-# set(Boost_COMPILER "-vc120")
+# set(Boost_COMPILER "-mgw81")
 if(NOT WIN32)
     # boost::process was introduced first in version 1.64.0
     set(MINIMUM_BOOST_VERSION "1.64.0")
@@ -251,7 +271,7 @@ endif()
 if(TARGET Boost::system)
     message(STATUS "Boost::boost exists")
     target_link_libraries(boost_headeronly INTERFACE Boost::boost)
-    target_link_libraries(boost_libs INTERFACE 
+    target_link_libraries(boost_libs INTERFACE
         boost_headeronly # includes the custom compile definitions as well
         Boost::system
         Boost::filesystem
diff --git a/cmake/modules/PrecompiledHeader.cmake b/cmake/modules/PrecompiledHeader.cmake
index e463021441..2f62a7dbeb 100644
--- a/cmake/modules/PrecompiledHeader.cmake
+++ b/cmake/modules/PrecompiledHeader.cmake
@@ -105,6 +105,9 @@ function(add_precompiled_header _target _input)
   cmake_parse_arguments(_PCH "FORCEINCLUDE" "SOURCE_CXX;SOURCE_C" "" ${ARGN})
 
   get_filename_component(_input_we ${_input} NAME_WE)
+  get_filename_component(_input_full ${_input} ABSOLUTE)
+  file(TO_NATIVE_PATH "${_input_full}" _input_fullpath)
+
   if(NOT _PCH_SOURCE_CXX)
     set(_PCH_SOURCE_CXX "${_input_we}.cpp")
   endif()
@@ -138,16 +141,16 @@ function(add_precompiled_header _target _input)
           set_source_files_properties("${_source}" PROPERTIES OBJECT_OUTPUTS "${_pch_c_pch}")
         else()
           if(_source MATCHES \\.\(cpp|cxx|cc\)$)
-            set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_cxx_pch}\" \"/Yu${_input}\"")
+            set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_cxx_pch}\" \"/Yu${_input_fullpath}\"")
             set(_pch_source_cxx_needed TRUE)
             set_source_files_properties("${_source}" PROPERTIES OBJECT_DEPENDS "${_pch_cxx_pch}")
           else()
-            set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_c_pch}\" \"/Yu${_input}\"")
+            set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_c_pch}\" \"/Yu${_input_fullpath}\"")
             set(_pch_source_c_needed TRUE)
             set_source_files_properties("${_source}" PROPERTIES OBJECT_DEPENDS "${_pch_c_pch}")
           endif()
           if(_PCH_FORCEINCLUDE)
-            set(_pch_compile_flags "${_pch_compile_flags} /FI${_input}")
+            set(_pch_compile_flags "${_pch_compile_flags} /FI${_input_fullpath}")
           endif(_PCH_FORCEINCLUDE)
         endif()
 
diff --git a/deps/CMakeLists.txt b/deps/CMakeLists.txt
index f6a80f3ca0..90ad6f0fa7 100644
--- a/deps/CMakeLists.txt
+++ b/deps/CMakeLists.txt
@@ -76,7 +76,10 @@ elseif (APPLE)
     endif ()
 
     include("deps-macos.cmake")
-else ()
+elseif (MINGW)
+    message(STATUS "Building for MinGW...")
+    include("deps-mingw.cmake")
+else()
     include("deps-linux.cmake")
 endif()
 
diff --git a/deps/deps-mingw.cmake b/deps/deps-mingw.cmake
new file mode 100644
index 0000000000..bfe5f9fe43
--- /dev/null
+++ b/deps/deps-mingw.cmake
@@ -0,0 +1,76 @@
+set(DEP_CMAKE_OPTS "-DCMAKE_POSITION_INDEPENDENT_CODE=ON")
+set(DEP_BOOST_TOOLSET "gcc")
+set(DEP_BITS 64)
+
+find_package(Git REQUIRED)
+
+# TODO make sure to build tbb with -flifetime-dse=1
+include("deps-unix-common.cmake")
+
+ExternalProject_Add(dep_boost
+    EXCLUDE_FROM_ALL 1
+    URL "https://dl.bintray.com/boostorg/release/1.70.0/source/boost_1_70_0.tar.gz"
+    URL_HASH SHA256=882b48708d211a5f48e60b0124cf5863c1534cd544ecd0664bb534a4b5d506e9
+    BUILD_IN_SOURCE 1
+    CONFIGURE_COMMAND bootstrap.bat
+    BUILD_COMMAND b2.exe
+        -j "${NPROC}"
+        --with-system
+        --with-filesystem
+        --with-thread
+        --with-log
+        --with-locale
+        --with-regex
+        "--prefix=${DESTDIR}/usr/local"
+        "address-model=${DEPS_BITS}"
+        "toolset=${DEP_BOOST_TOOLSET}"
+        link=static
+        define=BOOST_USE_WINAPI_VERSION=0x0502
+        variant=release
+        threading=multi
+        boost.locale.icu=off
+        "${DEP_BOOST_DEBUG}" release install
+    INSTALL_COMMAND ""   # b2 does that already
+)
+
+ExternalProject_Add(dep_libcurl
+    EXCLUDE_FROM_ALL 1
+    URL "https://curl.haxx.se/download/curl-7.58.0.tar.gz"
+    URL_HASH SHA256=cc245bf9a1a42a45df491501d97d5593392a03f7b4f07b952793518d97666115
+    CMAKE_ARGS
+        -DBUILD_SHARED_LIBS=OFF
+        -DBUILD_TESTING=OFF
+        -DCURL_STATICLIB=ON
+        -DCURL_STATIC_CRT=ON
+        -DENABLE_THREADED_RESOLVER=ON
+        -DCURL_DISABLE_FTP=ON
+        -DCURL_DISABLE_LDAP=ON
+        -DCURL_DISABLE_LDAPS=ON
+        -DCURL_DISABLE_TELNET=ON
+        -DCURL_DISABLE_DICT=ON
+        -DCURL_DISABLE_FILE=ON
+        -DCURL_DISABLE_TFTP=ON
+        -DCURL_DISABLE_RTSP=ON
+        -DCURL_DISABLE_POP3=ON
+        -DCURL_DISABLE_IMAP=ON
+        -DCURL_DISABLE_SMTP=ON
+        -DCURL_DISABLE_GOPHER=ON
+        -DCMAKE_INSTALL_PREFIX=${DESTDIR}/usr/local
+        ${DEP_CMAKE_OPTS}
+)
+
+ExternalProject_Add(dep_wxwidgets
+    EXCLUDE_FROM_ALL 1
+    GIT_REPOSITORY "https://github.com/prusa3d/wxWidgets"
+    GIT_TAG v3.1.1-patched
+#    URL "https://github.com/wxWidgets/wxWidgets/releases/download/v3.1.1/wxWidgets-3.1.1.tar.bz2"
+#    URL_HASH SHA256=c925dfe17e8f8b09eb7ea9bfdcfcc13696a3e14e92750effd839f5e10726159e
+#    PATCH_COMMAND "${CMAKE_COMMAND}" -E copy "${CMAKE_CURRENT_SOURCE_DIR}\\wxwidgets-pngprefix.h" src\\png\\pngprefix.h
+    CMAKE_ARGS
+        -DBUILD_SHARED_LIBS=OFF
+        -DwxUSE_LIBPNG=builtin
+        -DwxUSE_ZLIB=builtin
+        -DwxUSE_OPENGL=ON
+        -DCMAKE_INSTALL_PREFIX=${DESTDIR}/usr/local
+        ${DEP_CMAKE_OPTS}
+)
\ No newline at end of file
diff --git a/deps/deps-unix-common.cmake b/deps/deps-unix-common.cmake
index e323460a6d..6e559d05a3 100644
--- a/deps/deps-unix-common.cmake
+++ b/deps/deps-unix-common.cmake
@@ -1,6 +1,12 @@
 
 # The unix common part expects DEP_CMAKE_OPTS to be set
 
+if (MINGW)
+    set(TBB_MINGW_WORKAROUND "-flifetime-dse=1")
+else ()
+    set(TBB_MINGW_WORKAROUND "")
+endif ()
+
 ExternalProject_Add(dep_tbb
     EXCLUDE_FROM_ALL 1
     URL "https://github.com/wjakob/tbb/archive/a0dc9bf76d0120f917b641ed095360448cabc85b.tar.gz"
@@ -8,6 +14,7 @@ ExternalProject_Add(dep_tbb
     CMAKE_ARGS
         -DTBB_BUILD_SHARED=OFF
         -DTBB_BUILD_TESTS=OFF
+        -DCMAKE_CXX_FLAGS=${TBB_MINGW_WORKAROUND}
         -DCMAKE_INSTALL_PREFIX=${DESTDIR}/usr/local
         ${DEP_CMAKE_OPTS}
 )
diff --git a/deps/deps-windows.cmake b/deps/deps-windows.cmake
index 9092f330bc..85013fbddd 100644
--- a/deps/deps-windows.cmake
+++ b/deps/deps-windows.cmake
@@ -19,6 +19,10 @@ else ()
     message(FATAL_ERROR "Unsupported MSVC version")
 endif ()
 
+if (CMAKE_CXX_COMPILER_ID STREQUAL Clang)
+    set(DEP_BOOST_TOOLSET "clang-win")
+endif ()
+
 if (${DEPS_BITS} EQUAL 32)
     set(DEP_MSVC_GEN "Visual Studio ${DEP_VS_VER}")
     set(DEP_PLATFORM "Win32")
diff --git a/sandboxes/CMakeLists.txt b/sandboxes/CMakeLists.txt
index 0e1f52d6cf..5905c438e9 100644
--- a/sandboxes/CMakeLists.txt
+++ b/sandboxes/CMakeLists.txt
@@ -1 +1,2 @@
 add_subdirectory(slabasebed)
+add_subdirectory(slasupporttree)
diff --git a/sandboxes/slabasebed/slabasebed.cpp b/sandboxes/slabasebed/slabasebed.cpp
index 5393f61fd7..b8b94d86f3 100644
--- a/sandboxes/slabasebed/slabasebed.cpp
+++ b/sandboxes/slabasebed/slabasebed.cpp
@@ -5,6 +5,7 @@
 #include <libslic3r/libslic3r.h>
 #include <libslic3r/TriangleMesh.hpp>
 #include <libslic3r/Tesselate.hpp>
+#include <libslic3r/ClipperUtils.hpp>
 #include <libslic3r/SLA/SLABasePool.hpp>
 #include <libslic3r/SLA/SLABoilerPlate.hpp>
 #include <libnest2d/tools/benchmark.h>
@@ -15,8 +16,8 @@ const std::string USAGE_STR = {
 
 namespace Slic3r { namespace sla {
 
-Contour3D create_base_pool(const Polygons &ground_layer, 
-                           const Polygons &holes = {},
+Contour3D create_base_pool(const Polygons &ground_layer,
+                           const ExPolygons &holes = {},
                            const PoolConfig& cfg = PoolConfig());
 
 Contour3D walls(const Polygon& floor_plate, const Polygon& ceiling,
@@ -43,22 +44,22 @@ int main(const int argc, const char *argv[]) {
     model.ReadSTLFile(argv[1]);
     model.align_to_origin();
 
-    Polygons ground_slice;
+    ExPolygons ground_slice;
     sla::base_plate(model, ground_slice, 0.1f);
     if(ground_slice.empty()) return EXIT_FAILURE;
 
-    Polygon gndfirst; gndfirst = ground_slice.front();
-    sla::offset_with_breakstick_holes(gndfirst, 0.5, 10, 0.3);
+    ground_slice = offset_ex(ground_slice, 0.5);
+    ExPolygon gndfirst; gndfirst = ground_slice.front();
+    sla::breakstick_holes(gndfirst, 0.5, 10, 0.3);
 
     sla::Contour3D mesh;
 
-
     bench.start();
 
     sla::PoolConfig cfg;
     cfg.min_wall_height_mm = 0;
     cfg.edge_radius_mm = 0;
-    mesh = sla::create_base_pool(ground_slice, {}, cfg);
+    mesh = sla::create_base_pool(to_polygons(ground_slice), {}, cfg);
 
     bench.stop();
 
@@ -75,7 +76,7 @@ int main(const int argc, const char *argv[]) {
         if(std::abs(a) < 1e-6) std::cout << "degenerate triangle" << std::endl;
     }
 
-//    basepool.write_ascii("out.stl");
+    //    basepool.write_ascii("out.stl");
 
     std::fstream outstream("out.obj", std::fstream::out);
     mesh.to_obj(outstream);
diff --git a/sandboxes/slasupporttree/CMakeLists.txt b/sandboxes/slasupporttree/CMakeLists.txt
new file mode 100644
index 0000000000..79adb842b9
--- /dev/null
+++ b/sandboxes/slasupporttree/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_executable(slasupporttree slasupporttree.cpp)
+target_link_libraries(slasupporttree libslic3r ${Boost_LIBRARIES} ${TBB_LIBRARIES} ${Boost_LIBRARIES} ${CMAKE_DL_LIBS})
diff --git a/sandboxes/slasupporttree/slasupporttree.cpp b/sandboxes/slasupporttree/slasupporttree.cpp
new file mode 100644
index 0000000000..dcaddf6d3f
--- /dev/null
+++ b/sandboxes/slasupporttree/slasupporttree.cpp
@@ -0,0 +1,42 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+
+#include <libslic3r/libslic3r.h>
+#include <libslic3r/Model.hpp>
+#include <libslic3r/Tesselate.hpp>
+#include <libslic3r/ClipperUtils.hpp>
+#include <libslic3r/SLA/SLAAutoSupports.hpp>
+#include <libslic3r/SLA/SLASupportTree.hpp>
+#include <libslic3r/SLAPrint.hpp>
+#include <libslic3r/MTUtils.hpp>
+
+#include <tbb/parallel_for.h>
+#include <tbb/mutex.h>
+#include <future>
+
+const std::string USAGE_STR = {
+    "Usage: slasupporttree stlfilename.stl"
+};
+
+int main(const int argc, const char *argv[]) {
+    using namespace Slic3r;
+    using std::cout; using std::endl;
+
+    if(argc < 2) {
+        cout << USAGE_STR << endl;
+        return EXIT_SUCCESS;
+    }
+
+    DynamicPrintConfig config;
+
+    Model model = Model::read_from_file(argv[1], &config);
+
+    SLAPrint print;
+
+    print.apply(model, config);
+    print.process();
+
+
+    return EXIT_SUCCESS;
+}
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 3ee46289ad..31cb24f24a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,5 +1,6 @@
 project(PrusaSlicer-native)
 
+add_subdirectory(build-utils)
 add_subdirectory(admesh)
 add_subdirectory(avrdude)
 # boost/nowide
@@ -47,7 +48,7 @@ if (SLIC3R_GUI)
             endif ()
         endif ()
     else ()
-        find_package(wxWidgets 3.1 REQUIRED COMPONENTS base core adv html gl)
+        find_package(wxWidgets 3.1 REQUIRED COMPONENTS html adv gl core base)
     endif ()
 
     if(UNIX)
@@ -56,6 +57,9 @@ if (SLIC3R_GUI)
 
     include(${wxWidgets_USE_FILE})
 
+#    list(REMOVE_ITEM wxWidgets_LIBRARIES oleacc)
+    message(STATUS "wx libs: ${wxWidgets_LIBRARIES}")
+
     add_subdirectory(slic3r)
 endif()
 
@@ -65,12 +69,18 @@ endif()
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/platform/msw/PrusaSlicer.rc.in ${CMAKE_CURRENT_BINARY_DIR}/PrusaSlicer.rc @ONLY)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/platform/msw/PrusaSlicer.manifest.in ${CMAKE_CURRENT_BINARY_DIR}/PrusaSlicer.manifest @ONLY)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/platform/osx/Info.plist.in ${CMAKE_CURRENT_BINARY_DIR}/Info.plist @ONLY)
-if (MSVC)
+if (WIN32)
     add_library(PrusaSlicer SHARED PrusaSlicer.cpp PrusaSlicer.hpp)
 else ()
     add_executable(PrusaSlicer PrusaSlicer.cpp PrusaSlicer.hpp)
 endif ()
-if (NOT MSVC)
+
+if (MINGW)
+    target_link_options(PrusaSlicer PUBLIC "-Wl,-allow-multiple-definition")
+    set_target_properties(PrusaSlicer PROPERTIES PREFIX "")
+endif (MINGW)
+
+if (NOT WIN32)
     # Binary name on unix like systems (OSX, Linux)
     set_target_properties(PrusaSlicer PROPERTIES OUTPUT_NAME "prusa-slicer")
 endif ()
@@ -91,11 +101,12 @@ endif ()
 
 # Add the Slic3r GUI library, libcurl, OpenGL and GLU libraries.
 if (SLIC3R_GUI)
-    target_link_libraries(PrusaSlicer libslic3r_gui ${wxWidgets_LIBRARIES})
+#    target_link_libraries(PrusaSlicer ws2_32 uxtheme setupapi libslic3r_gui ${wxWidgets_LIBRARIES})
+target_link_libraries(PrusaSlicer libslic3r_gui ${wxWidgets_LIBRARIES})
 
     # Configure libcurl and its dependencies OpenSSL & zlib
     find_package(CURL REQUIRED)
-    if (NOT MSVC)
+    if (NOT WIN32)
         # Required by libcurl
         find_package(ZLIB REQUIRED)
     endif()
@@ -123,7 +134,7 @@ if (SLIC3R_GUI)
         target_link_options(PrusaSlicer PUBLIC "$<$<CONFIG:RELEASE>:/DEBUG>")
         target_link_libraries(PrusaSlicer user32.lib Setupapi.lib OpenGL32.Lib GlU32.Lib)
     elseif (MINGW)
-        target_link_libraries(PrusaSlicer -lopengl32)
+        target_link_libraries(PrusaSlicer opengl32 ws2_32 uxtheme setupapi)
     elseif (APPLE)
         target_link_libraries(PrusaSlicer "-framework OpenGL")
     else ()
@@ -133,10 +144,16 @@ endif ()
 
 # On Windows, a shim application is required to produce a console / non console version of the Slic3r application.
 # Also the shim may load the Mesa software OpenGL renderer if the default renderer does not support OpenGL 2.0 and higher.
-if (MSVC)
+if (WIN32)
+    if (MINGW)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -municode")
+    endif()
+
     add_executable(PrusaSlicer_app_gui WIN32 PrusaSlicer_app_msvc.cpp ${CMAKE_CURRENT_BINARY_DIR}/PrusaSlicer.rc)
     # Generate debug symbols even in release mode.
-    target_link_options(PrusaSlicer_app_gui PUBLIC "$<$<CONFIG:RELEASE>:/DEBUG>")
+    if(MSVC)
+        target_link_options(PrusaSlicer_app_gui PUBLIC "$<$<CONFIG:RELEASE>:/DEBUG>")
+    endif()
     target_compile_definitions(PrusaSlicer_app_gui PRIVATE -DSLIC3R_WRAPPER_NOCONSOLE)
     add_dependencies(PrusaSlicer_app_gui PrusaSlicer)
     set_target_properties(PrusaSlicer_app_gui PROPERTIES OUTPUT_NAME "prusa-slicer")
@@ -144,7 +161,9 @@ if (MSVC)
 
     add_executable(PrusaSlicer_app_console PrusaSlicer_app_msvc.cpp ${CMAKE_CURRENT_BINARY_DIR}/PrusaSlicer.rc)
     # Generate debug symbols even in release mode.
+    if (MSVC)
     target_link_options(PrusaSlicer_app_console PUBLIC "$<$<CONFIG:RELEASE>:/DEBUG>")
+    endif ()
     target_compile_definitions(PrusaSlicer_app_console PRIVATE -DSLIC3R_WRAPPER_CONSOLE)
     add_dependencies(PrusaSlicer_app_console PrusaSlicer)
     set_target_properties(PrusaSlicer_app_console PROPERTIES OUTPUT_NAME "prusa-slicer-console")
@@ -152,7 +171,7 @@ if (MSVC)
 endif ()
 
 # Link the resources dir to where Slic3r GUI expects it
-if (MSVC)
+if (WIN32)
     if (CMAKE_CONFIGURATION_TYPES)
         foreach (CONF ${CMAKE_CONFIGURATION_TYPES})
             file(TO_NATIVE_PATH "${CMAKE_CURRENT_BINARY_DIR}/${CONF}" WIN_CONF_OUTPUT_DIR)
diff --git a/src/PrusaSlicer.cpp b/src/PrusaSlicer.cpp
index 45a3336304..ccbe0ab542 100644
--- a/src/PrusaSlicer.cpp
+++ b/src/PrusaSlicer.cpp
@@ -7,8 +7,8 @@
     #include <Windows.h>
     #include <wchar.h>
     #ifdef SLIC3R_GUI
-    extern "C" 
-    { 
+    extern "C"
+    {
         // Let the NVIDIA and AMD know we want to use their graphics card
         // on a dual graphics card system.
         __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
@@ -54,14 +54,31 @@ using namespace Slic3r;
 
 PrinterTechnology get_printer_technology(const DynamicConfig &config)
 {
-	const ConfigOptionEnum<PrinterTechnology> *opt = config.option<ConfigOptionEnum<PrinterTechnology>>("printer_technology");
+    const ConfigOptionEnum<PrinterTechnology> *opt = config.option<ConfigOptionEnum<PrinterTechnology>>("printer_technology");
     return (opt == nullptr) ? ptUnknown : opt->value;
 }
 
-int CLI::run(int argc, char **argv) 
+int CLI::run(int argc, char **argv)
 {
 	// Switch boost::filesystem to utf8.
-    boost::nowide::nowide_filesystem();
+    try {
+        boost::nowide::nowide_filesystem();
+    } catch (const std::runtime_error& ex) {
+        std::string caption = std::string(SLIC3R_APP_NAME) + " Error";
+        std::string text = std::string("An error occured while setting up locale.\n") + (
+#if !defined(_WIN32) && !defined(__APPLE__)
+        	// likely some linux system
+        	"You may need to reconfigure the missing locales, likely by running the \"locale-gen\" and \"dpkg-reconfigure locales\" commands.\n"
+#endif
+        	SLIC3R_APP_NAME " will now terminate.\n\n") + ex.what();
+    #if defined(_WIN32) && defined(SLIC3R_GUI)
+        if (m_actions.empty())
+        	// Empty actions means Slicer is executed in the GUI mode. Show a GUI message.
+            MessageBoxA(NULL, text.c_str(), caption.c_str(), MB_OK | MB_ICONERROR);
+    #endif
+        boost::nowide::cerr << text.c_str() << std::endl;
+        return 1;
+    }
 
 	if (! this->setup(argc, argv))
 		return 1;
@@ -71,14 +88,14 @@ int CLI::run(int argc, char **argv)
 
     bool							start_gui			= m_actions.empty() &&
         // cutting transformations are setting an "export" action.
-		std::find(m_transforms.begin(), m_transforms.end(), "cut") == m_transforms.end() &&
-		std::find(m_transforms.begin(), m_transforms.end(), "cut_x") == m_transforms.end() &&
-		std::find(m_transforms.begin(), m_transforms.end(), "cut_y") == m_transforms.end();
+        std::find(m_transforms.begin(), m_transforms.end(), "cut") == m_transforms.end() &&
+        std::find(m_transforms.begin(), m_transforms.end(), "cut_x") == m_transforms.end() &&
+        std::find(m_transforms.begin(), m_transforms.end(), "cut_y") == m_transforms.end();
     PrinterTechnology				printer_technology	= get_printer_technology(m_extra_config);
-	const std::vector<std::string> &load_configs		= m_config.option<ConfigOptionStrings>("load", true)->values;
-    
+    const std::vector<std::string> &load_configs		= m_config.option<ConfigOptionStrings>("load", true)->values;
+
     // load config files supplied via --load
-	for (auto const &file : load_configs) {
+    for (auto const &file : load_configs) {
         if (! boost::filesystem::exists(file)) {
             if (m_config.opt_bool("ignore_nonexistent_config")) {
                 continue;
@@ -104,7 +121,7 @@ int CLI::run(int argc, char **argv)
         }
         m_print_config.apply(config);
     }
-        
+
     // Read input file(s) if any.
     for (const std::string &file : m_input_files) {
         if (! boost::filesystem::exists(file)) {
@@ -140,21 +157,21 @@ int CLI::run(int argc, char **argv)
     m_print_config.normalize();
 
     if (printer_technology == ptUnknown)
-		printer_technology = std::find(m_actions.begin(), m_actions.end(), "export_sla") == m_actions.end() ? ptFFF : ptSLA;
+        printer_technology = std::find(m_actions.begin(), m_actions.end(), "export_sla") == m_actions.end() ? ptFFF : ptSLA;
 
     // Initialize full print configs for both the FFF and SLA technologies.
     FullPrintConfig    fff_print_config;
 //    SLAFullPrintConfig sla_print_config;
     fff_print_config.apply(m_print_config, true);
 //    sla_print_config.apply(m_print_config, true);
-    
+
     // Loop through transform options.
     for (auto const &opt_key : m_transforms) {
         if (opt_key == "merge") {
             Model m;
             for (auto &model : m_models)
-				for (ModelObject *o : model.objects)
-					m.add_object(*o);
+                for (ModelObject *o : model.objects)
+                    m.add_object(*o);
             // Rearrange instances unless --dont-arrange is supplied
             if (! m_config.opt_bool("dont_arrange")) {
                 m.add_default_instances();
@@ -166,8 +183,8 @@ int CLI::run(int argc, char **argv)
                     this->has_print_action() ? &bb : nullptr
                 );
             }
-			m_models.clear();
-			m_models.emplace_back(std::move(m));
+            m_models.clear();
+            m_models.emplace_back(std::move(m));
         } else if (opt_key == "duplicate") {
             const BoundingBoxf &bb = fff_print_config.bed_shape.values;
             for (auto &model : m_models) {
@@ -196,11 +213,11 @@ int CLI::run(int argc, char **argv)
                 // this affects instances:
                 model.center_instances_around_point(m_config.option<ConfigOptionPoint>("center")->value);
                 // this affects volumes:
-				//FIXME Vojtech: Who knows why the complete model should be aligned with Z as a single rigid body?
+                //FIXME Vojtech: Who knows why the complete model should be aligned with Z as a single rigid body?
                 //model.align_to_ground();
                 BoundingBoxf3 bbox;
                 for (ModelObject *model_object : model.objects)
-					// We are interested into the Z span only, therefore it is sufficient to measure the bounding box of the 1st instance only.
+                    // We are interested into the Z span only, therefore it is sufficient to measure the bounding box of the 1st instance only.
                     bbox.merge(model_object->instance_bounding_box(0, false));
                 for (ModelObject *model_object : model.objects)
                     for (ModelInstance *model_instance : model_object->instances)
@@ -211,7 +228,7 @@ int CLI::run(int argc, char **argv)
             for (auto &model : m_models) {
                 BoundingBoxf3 bb = model.bounding_box();
                 // this affects volumes:
-				model.translate(-(bb.min.x() - p.x()), -(bb.min.y() - p.y()), -bb.min.z());
+                model.translate(-(bb.min.x() - p.x()), -(bb.min.y() - p.y()), -bb.min.z());
             }
         } else if (opt_key == "dont_arrange") {
             // do nothing - this option alters other transform options
@@ -249,8 +266,8 @@ int CLI::run(int argc, char **argv)
             std::vector<Model> new_models;
             for (auto &model : m_models) {
                 model.translate(0, 0, -model.bounding_box().min.z());  // align to z = 0
-				size_t num_objects = model.objects.size();
-				for (size_t i = 0; i < num_objects; ++ i) {
+                size_t num_objects = model.objects.size();
+                for (size_t i = 0; i < num_objects; ++ i) {
 
 #if 0
                     if (opt_key == "cut_x") {
@@ -261,15 +278,15 @@ int CLI::run(int argc, char **argv)
                         o->cut(Z, m_config.opt_float("cut"), &out);
                     }
 #else
-					model.objects.front()->cut(0, m_config.opt_float("cut"), true, true, true);
+                    model.objects.front()->cut(0, m_config.opt_float("cut"), true, true, true);
 #endif
-					model.delete_object(size_t(0));
+                    model.delete_object(size_t(0));
                 }
             }
-            
+
             // TODO: copy less stuff around using pointers
             m_models = new_models;
-            
+
             if (m_actions.empty())
                 m_actions.push_back("export_stl");
         }
@@ -279,7 +296,7 @@ int CLI::run(int argc, char **argv)
             for (auto &model : m_models) {
                 TriangleMesh mesh = model.mesh();
                 mesh.repair();
-            
+
                 TriangleMeshPtrs meshes = mesh.cut_by_grid(m_config.option<ConfigOptionPoint>("cut_grid")->value);
                 size_t i = 0;
                 for (TriangleMesh* m : meshes) {
@@ -290,10 +307,10 @@ int CLI::run(int argc, char **argv)
                     delete m;
                 }
             }
-            
+
             // TODO: copy less stuff around using pointers
             m_models = new_models;
-            
+
             if (m_actions.empty())
                 m_actions.push_back("export_stl");
         }
@@ -307,7 +324,7 @@ int CLI::run(int argc, char **argv)
                 }
             }
         } else if (opt_key == "repair") {
-			// Models are repaired by default.
+            // Models are repaired by default.
             //for (auto &model : m_models)
             //    model.repair();
         } else {
@@ -315,7 +332,7 @@ int CLI::run(int argc, char **argv)
             return 1;
         }
     }
-    
+
     // loop through action options
     for (auto const &opt_key : m_actions) {
         if (opt_key == "help") {
@@ -358,14 +375,14 @@ int CLI::run(int argc, char **argv)
                 boost::nowide::cerr << "error: cannot export SLA slices for a SLA configuration" << std::endl;
                 return 1;
             }
-			// Make a copy of the model if the current action is not the last action, as the model may be
-			// modified by the centering and such.
-			Model model_copy;
-			bool  make_copy = &opt_key != &m_actions.back();
+            // Make a copy of the model if the current action is not the last action, as the model may be
+            // modified by the centering and such.
+            Model model_copy;
+            bool  make_copy = &opt_key != &m_actions.back();
             for (Model &model_in : m_models) {
-				if (make_copy)
-					model_copy = model_in;
-				Model &model = make_copy ? model_copy : model_in;
+                if (make_copy)
+                    model_copy = model_in;
+                Model &model = make_copy ? model_copy : model_in;
                 // If all objects have defined instances, their relative positions will be
                 // honored when printing (they will be only centered, unless --dont-arrange
                 // is supplied); if any object has no instances, it will get a default one
@@ -385,7 +402,7 @@ int CLI::run(int argc, char **argv)
                 if (! m_config.opt_bool("dont_arrange")) {
                     //FIXME make the min_object_distance configurable.
                     model.arrange_objects(fff_print.config().min_object_distance());
-					model.center_instances_around_point(m_config.option<ConfigOptionPoint>("center")->value);
+                    model.center_instances_around_point(m_config.option<ConfigOptionPoint>("center")->value);
                 }
                 if (printer_technology == ptFFF) {
                     for (auto* mo : model.objects)
@@ -399,40 +416,40 @@ int CLI::run(int argc, char **argv)
                 }
                 if (print->empty())
                     boost::nowide::cout << "Nothing to print for " << outfile << " . Either the print is empty or no object is fully inside the print volume." << std::endl;
-                else 
+                else
                     try {
                         std::string outfile_final;
-						print->process();
+                        print->process();
                         if (printer_technology == ptFFF) {
                             // The outfile is processed by a PlaceholderParser.
                             outfile = fff_print.export_gcode(outfile, nullptr);
                             outfile_final = fff_print.print_statistics().finalize_output_path(outfile);
                         } else {
-							outfile = sla_print.output_filepath(outfile);
+                            outfile = sla_print.output_filepath(outfile);
                             // We need to finalize the filename beforehand because the export function sets the filename inside the zip metadata
                             outfile_final = sla_print.print_statistics().finalize_output_path(outfile);
-							sla_print.export_raster(outfile_final);
+                            sla_print.export_raster(outfile_final);
                         }
-                        if (outfile != outfile_final && Slic3r::rename_file(outfile, outfile_final) != 0) {
-							boost::nowide::cerr << "Renaming file " << outfile << " to " << outfile_final << " failed" << std::endl;
+                        if (outfile != outfile_final && Slic3r::rename_file(outfile, outfile_final)) {
+                            boost::nowide::cerr << "Renaming file " << outfile << " to " << outfile_final << " failed" << std::endl;
                             return 1;
                         }
                         boost::nowide::cout << "Slicing result exported to " << outfile << std::endl;
                     } catch (const std::exception &ex) {
-						boost::nowide::cerr << ex.what() << std::endl;
-                        return 1;                        
+                        boost::nowide::cerr << ex.what() << std::endl;
+                        return 1;
                     }
 /*
                 print.center = ! m_config.has("center")
                     && ! m_config.has("align_xy")
                     && ! m_config.opt_bool("dont_arrange");
                 print.set_model(model);
-                
+
                 // start chronometer
                 typedef std::chrono::high_resolution_clock clock_;
                 typedef std::chrono::duration<double, std::ratio<1> > second_;
                 std::chrono::time_point<clock_> t0{ clock_::now() };
-                
+
                 const std::string outfile = this->output_filepath(model, IO::Gcode);
                 try {
                     print.export_gcode(outfile);
@@ -441,7 +458,7 @@ int CLI::run(int argc, char **argv)
                     return 1;
                 }
                 boost::nowide::cout << "G-code exported to " << outfile << std::endl;
-                
+
                 // output some statistics
                 double duration { std::chrono::duration_cast<second_>(clock_::now() - t0).count() };
                 boost::nowide::cout << std::fixed << std::setprecision(0)
@@ -458,45 +475,45 @@ int CLI::run(int argc, char **argv)
             return 1;
         }
     }
-    
-	if (start_gui) {
+
+    if (start_gui) {
 #ifdef SLIC3R_GUI
 // #ifdef USE_WX
-		GUI::GUI_App *gui = new GUI::GUI_App();
+        GUI::GUI_App *gui = new GUI::GUI_App();
 //		gui->autosave = m_config.opt_string("autosave");
-		GUI::GUI_App::SetInstance(gui);
-		gui->CallAfter([gui, this, &load_configs] {
-			if (!gui->initialized()) {
-				return;
-			}
+        GUI::GUI_App::SetInstance(gui);
+        gui->CallAfter([gui, this, &load_configs] {
+            if (!gui->initialized()) {
+                return;
+            }
 #if 0
-			// Load the cummulative config over the currently active profiles.
-			//FIXME if multiple configs are loaded, only the last one will have an effect.
-			// We need to decide what to do about loading of separate presets (just print preset, just filament preset etc).
-			// As of now only the full configs are supported here.
-			if (!m_print_config.empty())
-				gui->mainframe->load_config(m_print_config);
+            // Load the cummulative config over the currently active profiles.
+            //FIXME if multiple configs are loaded, only the last one will have an effect.
+            // We need to decide what to do about loading of separate presets (just print preset, just filament preset etc).
+            // As of now only the full configs are supported here.
+            if (!m_print_config.empty())
+                gui->mainframe->load_config(m_print_config);
 #endif
-			if (! load_configs.empty())
-				// Load the last config to give it a name at the UI. The name of the preset may be later
-				// changed by loading an AMF or 3MF.
-				//FIXME this is not strictly correct, as one may pass a print/filament/printer profile here instead of a full config.
-				gui->mainframe->load_config_file(load_configs.back());
-			// If loading a 3MF file, the config is loaded from the last one.
-			if (! m_input_files.empty())
-				gui->plater()->load_files(m_input_files, true, true);
-			if (! m_extra_config.empty())
-				gui->mainframe->load_config(m_extra_config);
-		});
-		return wxEntry(argc, argv);
+            if (! load_configs.empty())
+                // Load the last config to give it a name at the UI. The name of the preset may be later
+                // changed by loading an AMF or 3MF.
+                //FIXME this is not strictly correct, as one may pass a print/filament/printer profile here instead of a full config.
+                gui->mainframe->load_config_file(load_configs.back());
+            // If loading a 3MF file, the config is loaded from the last one.
+            if (! m_input_files.empty())
+                gui->plater()->load_files(m_input_files, true, true);
+            if (! m_extra_config.empty())
+                gui->mainframe->load_config(m_extra_config);
+        });
+        return wxEntry(argc, argv);
 #else /* SLIC3R_GUI */
-		// No GUI support. Just print out a help.
-		this->print_help(false);
-		// If started without a parameter, consider it to be OK, otherwise report an error code (no action etc).
-		return (argc == 0) ? 0 : 1;
+        // No GUI support. Just print out a help.
+        this->print_help(false);
+        // If started without a parameter, consider it to be OK, otherwise report an error code (no action etc).
+        return (argc == 0) ? 0 : 1;
 #endif /* SLIC3R_GUI */
     }
-    
+
     return 0;
 }
 
@@ -544,18 +561,18 @@ bool CLI::setup(int argc, char **argv)
     // If any option is unsupported, print usage and abort immediately.
     t_config_option_keys opt_order;
     if (! m_config.read_cli(argc, argv, &m_input_files, &opt_order)) {
-		// Separate error message reported by the CLI parser from the help.
-		boost::nowide::cerr << std::endl;
+        // Separate error message reported by the CLI parser from the help.
+        boost::nowide::cerr << std::endl;
         this->print_help();
-		return false;
+        return false;
+    }
+    // Parse actions and transform options.
+    for (auto const &opt_key : opt_order) {
+        if (cli_actions_config_def.has(opt_key))
+            m_actions.emplace_back(opt_key);
+        else if (cli_transform_config_def.has(opt_key))
+            m_transforms.emplace_back(opt_key);
     }
-	// Parse actions and transform options.
-	for (auto const &opt_key : opt_order) {
-		if (cli_actions_config_def.has(opt_key))
-			m_actions.emplace_back(opt_key);
-		else if (cli_transform_config_def.has(opt_key))
-			m_transforms.emplace_back(opt_key);
-	}
 
     {
         const ConfigOptionInt *opt_loglevel = m_config.opt<ConfigOptionInt>("loglevel");
@@ -568,15 +585,15 @@ bool CLI::setup(int argc, char **argv)
         for (const std::pair<t_config_option_key, ConfigOptionDef> &optdef : *options)
             m_config.optptr(optdef.first, true);
 
-	set_data_dir(m_config.opt_string("datadir"));
+    set_data_dir(m_config.opt_string("datadir"));
 
-	return true;
+    return true;
 }
 
-void CLI::print_help(bool include_print_options, PrinterTechnology printer_technology) const 
+void CLI::print_help(bool include_print_options, PrinterTechnology printer_technology) const
 {
     boost::nowide::cout
-		<< SLIC3R_BUILD_ID << " " << "based on Slic3r"
+        << SLIC3R_BUILD_ID << " " << "based on Slic3r"
 #ifdef SLIC3R_GUI
         << " (with GUI support)"
 #else /* SLIC3R_GUI */
@@ -588,20 +605,20 @@ void CLI::print_help(bool include_print_options, PrinterTechnology printer_techn
         << std::endl
         << "Actions:" << std::endl;
     cli_actions_config_def.print_cli_help(boost::nowide::cout, false);
-    
+
     boost::nowide::cout
         << std::endl
         << "Transform options:" << std::endl;
         cli_transform_config_def.print_cli_help(boost::nowide::cout, false);
-    
+
     boost::nowide::cout
         << std::endl
         << "Other options:" << std::endl;
         cli_misc_config_def.print_cli_help(boost::nowide::cout, false);
-    
+
     if (include_print_options) {
         boost::nowide::cout << std::endl;
-		print_config_def.print_cli_help(boost::nowide::cout, true, [printer_technology](const ConfigOptionDef &def)
+        print_config_def.print_cli_help(boost::nowide::cout, true, [printer_technology](const ConfigOptionDef &def)
             { return printer_technology == ptAny || def.printer_technology == ptAny || printer_technology == def.printer_technology; });
     } else {
         boost::nowide::cout
@@ -618,14 +635,14 @@ bool CLI::export_models(IO::ExportFormat format)
         switch (format) {
             case IO::AMF: success = Slic3r::store_amf(path.c_str(), &model, nullptr); break;
             case IO::OBJ: success = Slic3r::store_obj(path.c_str(), &model);          break;
-			case IO::STL: success = Slic3r::store_stl(path.c_str(), &model, true);    break;
-			case IO::TMF: success = Slic3r::store_3mf(path.c_str(), &model, nullptr); break;
+            case IO::STL: success = Slic3r::store_stl(path.c_str(), &model, true);    break;
+            case IO::TMF: success = Slic3r::store_3mf(path.c_str(), &model, nullptr); break;
             default: assert(false); break;
         }
         if (success)
-			std::cout << "File exported to " << path << std::endl;
+            std::cout << "File exported to " << path << std::endl;
         else {
-			std::cerr << "File export to " << path << " failed" << std::endl;
+            std::cerr << "File export to " << path << " failed" << std::endl;
             return false;
         }
     }
@@ -639,12 +656,12 @@ std::string CLI::output_filepath(const Model &model, IO::ExportFormat format) co
         case IO::AMF: ext = ".zip.amf"; break;
         case IO::OBJ: ext = ".obj"; break;
         case IO::STL: ext = ".stl"; break;
-		case IO::TMF: ext = ".3mf"; break;
+        case IO::TMF: ext = ".3mf"; break;
         default: assert(false); break;
     };
     auto proposed_path = boost::filesystem::path(model.propose_export_file_name_and_path(ext));
     // use --output when available
-	std::string cmdline_param = m_config.opt_string("output");
+    std::string cmdline_param = m_config.opt_string("output");
     if (! cmdline_param.empty()) {
         // if we were supplied a directory, use it and append our automatically generated filename
         boost::filesystem::path cmdline_path(cmdline_param);
@@ -656,20 +673,20 @@ std::string CLI::output_filepath(const Model &model, IO::ExportFormat format) co
     return proposed_path.string();
 }
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || defined(__MINGW32__)
 extern "C" {
-	__declspec(dllexport) int __stdcall slic3r_main(int argc, wchar_t **argv)
-	{
-		// Convert wchar_t arguments to UTF8.
-		std::vector<std::string> 	argv_narrow;
-		std::vector<char*>			argv_ptrs(argc + 1, nullptr);
-		for (size_t i = 0; i < argc; ++ i)
-			argv_narrow.emplace_back(boost::nowide::narrow(argv[i]));
-		for (size_t i = 0; i < argc; ++ i)
-			argv_ptrs[i] = const_cast<char*>(argv_narrow[i].data());
-		// Call the UTF8 main.
-		return CLI().run(argc, argv_ptrs.data());
-	}
+    __declspec(dllexport) int __stdcall slic3r_main(int argc, wchar_t **argv)
+    {
+        // Convert wchar_t arguments to UTF8.
+        std::vector<std::string> 	argv_narrow;
+        std::vector<char*>			argv_ptrs(argc + 1, nullptr);
+        for (size_t i = 0; i < argc; ++ i)
+            argv_narrow.emplace_back(boost::nowide::narrow(argv[i]));
+        for (size_t i = 0; i < argc; ++ i)
+            argv_ptrs[i] = const_cast<char*>(argv_narrow[i].data());
+        // Call the UTF8 main.
+        return CLI().run(argc, argv_ptrs.data());
+    }
 }
 #else /* _MSC_VER */
 int main(int argc, char **argv)
diff --git a/src/PrusaSlicer_app_msvc.cpp b/src/PrusaSlicer_app_msvc.cpp
index 95dd4fb075..b3d1e8bb47 100644
--- a/src/PrusaSlicer_app_msvc.cpp
+++ b/src/PrusaSlicer_app_msvc.cpp
@@ -8,12 +8,12 @@
 #include <wchar.h>
 
 #ifdef SLIC3R_GUI
-extern "C" 
-{ 
-	// Let the NVIDIA and AMD know we want to use their graphics card
-	// on a dual graphics card system.
-	__declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
-	__declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
+extern "C"
+{
+    // Let the NVIDIA and AMD know we want to use their graphics card
+    // on a dual graphics card system.
+    __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
+    __declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
 }
 #endif /* SLIC3R_GUI */
 
@@ -21,7 +21,7 @@ extern "C"
 #include <stdio.h>
 
 #ifdef SLIC3R_GUI
-	#include <GL/GL.h>
+    #include <GL/GL.h>
 #endif /* SLIC3R_GUI */
 
 #include <string>
@@ -36,97 +36,97 @@ extern "C"
 class OpenGLVersionCheck
 {
 public:
-	std::string version;
-	std::string glsl_version;
-	std::string vendor;
-	std::string renderer;
+    std::string version;
+    std::string glsl_version;
+    std::string vendor;
+    std::string renderer;
 
-	HINSTANCE   hOpenGL = nullptr;
-	bool 		success = false;
+    HINSTANCE   hOpenGL = nullptr;
+    bool 		success = false;
 
-	bool load_opengl_dll()
-	{
-	    MSG      msg     = {0};
-	    WNDCLASS wc      = {0}; 
-	    wc.lpfnWndProc   = OpenGLVersionCheck::supports_opengl2_wndproc;
-	    wc.hInstance     = (HINSTANCE)GetModuleHandle(nullptr);
-	    wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND);
-	    wc.lpszClassName = L"PrusaSlicer_opengl_version_check";
-	    wc.style = CS_OWNDC;
-	    if (RegisterClass(&wc)) {
-			HWND hwnd = CreateWindowW(wc.lpszClassName, L"PrusaSlicer_opengl_version_check", WS_OVERLAPPEDWINDOW, 0, 0, 640, 480, 0, 0, wc.hInstance, (LPVOID)this);
-			if (hwnd) {
-				message_pump_exit = false;
-			    while (GetMessage(&msg, NULL, 0, 0 ) > 0 && ! message_pump_exit)
-			        DispatchMessage(&msg);
-			}
-		}
-	    return this->success;
-	}
+    bool load_opengl_dll()
+    {
+        MSG      msg     = {0};
+        WNDCLASS wc      = {0};
+        wc.lpfnWndProc   = OpenGLVersionCheck::supports_opengl2_wndproc;
+        wc.hInstance     = (HINSTANCE)GetModuleHandle(nullptr);
+        wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND);
+        wc.lpszClassName = L"PrusaSlicer_opengl_version_check";
+        wc.style = CS_OWNDC;
+        if (RegisterClass(&wc)) {
+            HWND hwnd = CreateWindowW(wc.lpszClassName, L"PrusaSlicer_opengl_version_check", WS_OVERLAPPEDWINDOW, 0, 0, 640, 480, 0, 0, wc.hInstance, (LPVOID)this);
+            if (hwnd) {
+                message_pump_exit = false;
+                while (GetMessage(&msg, NULL, 0, 0 ) > 0 && ! message_pump_exit)
+                    DispatchMessage(&msg);
+            }
+        }
+        return this->success;
+    }
 
-	void unload_opengl_dll() 
-	{
-		if (this->hOpenGL) {
-			BOOL released = FreeLibrary(this->hOpenGL);
-			if (released)
-				printf("System OpenGL library released\n");
-			else
-				printf("System OpenGL library NOT released\n");
-			this->hOpenGL = nullptr;
-		}
-	}
+    void unload_opengl_dll()
+    {
+        if (this->hOpenGL) {
+            BOOL released = FreeLibrary(this->hOpenGL);
+            if (released)
+                printf("System OpenGL library released\n");
+            else
+                printf("System OpenGL library NOT released\n");
+            this->hOpenGL = nullptr;
+        }
+    }
 
-	bool is_version_greater_or_equal_to(unsigned int major, unsigned int minor) const
-	{
-		// printf("is_version_greater_or_equal_to, version: %s\n", version.c_str());
-	    std::vector<std::string> tokens;
-	    boost::split(tokens, version, boost::is_any_of(" "), boost::token_compress_on);
-	    if (tokens.empty())
-	        return false;
+    bool is_version_greater_or_equal_to(unsigned int major, unsigned int minor) const
+    {
+        // printf("is_version_greater_or_equal_to, version: %s\n", version.c_str());
+        std::vector<std::string> tokens;
+        boost::split(tokens, version, boost::is_any_of(" "), boost::token_compress_on);
+        if (tokens.empty())
+            return false;
 
-	    std::vector<std::string> numbers;
-	    boost::split(numbers, tokens[0], boost::is_any_of("."), boost::token_compress_on);
+        std::vector<std::string> numbers;
+        boost::split(numbers, tokens[0], boost::is_any_of("."), boost::token_compress_on);
 
-	    unsigned int gl_major = 0;
-	    unsigned int gl_minor = 0;
-	    if (numbers.size() > 0)
-	        gl_major = ::atoi(numbers[0].c_str());
-	    if (numbers.size() > 1)
-	        gl_minor = ::atoi(numbers[1].c_str());
-	    // printf("Major: %d, minor: %d\n", gl_major, gl_minor);
-	    if (gl_major < major)
-	        return false;
-	    else if (gl_major > major)
-	        return true;
-	    else
-	        return gl_minor >= minor;
-	}
+        unsigned int gl_major = 0;
+        unsigned int gl_minor = 0;
+        if (numbers.size() > 0)
+            gl_major = ::atoi(numbers[0].c_str());
+        if (numbers.size() > 1)
+            gl_minor = ::atoi(numbers[1].c_str());
+        // printf("Major: %d, minor: %d\n", gl_major, gl_minor);
+        if (gl_major < major)
+            return false;
+        else if (gl_major > major)
+            return true;
+        else
+            return gl_minor >= minor;
+    }
 
 protected:
-	static bool message_pump_exit;
+    static bool message_pump_exit;
 
-	void check(HWND hWnd)
-	{
-		hOpenGL = LoadLibraryExW(L"opengl32.dll", nullptr, 0);
-		if (hOpenGL == nullptr) {
-			printf("Failed loading the system opengl32.dll\n");
-			return;
-		}
+    void check(HWND hWnd)
+    {
+        hOpenGL = LoadLibraryExW(L"opengl32.dll", nullptr, 0);
+        if (hOpenGL == nullptr) {
+            printf("Failed loading the system opengl32.dll\n");
+            return;
+        }
 
-		typedef HGLRC 		(WINAPI *Func_wglCreateContext)(HDC);
-		typedef BOOL 		(WINAPI *Func_wglMakeCurrent  )(HDC, HGLRC);
-		typedef BOOL     	(WINAPI *Func_wglDeleteContext)(HGLRC);
-		typedef GLubyte* 	(WINAPI *Func_glGetString     )(GLenum);
+        typedef HGLRC 		(WINAPI *Func_wglCreateContext)(HDC);
+        typedef BOOL 		(WINAPI *Func_wglMakeCurrent  )(HDC, HGLRC);
+        typedef BOOL     	(WINAPI *Func_wglDeleteContext)(HGLRC);
+        typedef GLubyte* 	(WINAPI *Func_glGetString     )(GLenum);
 
-		Func_wglCreateContext 	wglCreateContext = (Func_wglCreateContext)GetProcAddress(hOpenGL, "wglCreateContext");
-		Func_wglMakeCurrent 	wglMakeCurrent 	 = (Func_wglMakeCurrent)  GetProcAddress(hOpenGL, "wglMakeCurrent");
-		Func_wglDeleteContext 	wglDeleteContext = (Func_wglDeleteContext)GetProcAddress(hOpenGL, "wglDeleteContext");
-		Func_glGetString 		glGetString 	 = (Func_glGetString)	  GetProcAddress(hOpenGL, "glGetString");
+        Func_wglCreateContext 	wglCreateContext = (Func_wglCreateContext)GetProcAddress(hOpenGL, "wglCreateContext");
+        Func_wglMakeCurrent 	wglMakeCurrent 	 = (Func_wglMakeCurrent)  GetProcAddress(hOpenGL, "wglMakeCurrent");
+        Func_wglDeleteContext 	wglDeleteContext = (Func_wglDeleteContext)GetProcAddress(hOpenGL, "wglDeleteContext");
+        Func_glGetString 		glGetString 	 = (Func_glGetString)	  GetProcAddress(hOpenGL, "glGetString");
 
-		if (wglCreateContext == nullptr || wglMakeCurrent == nullptr || wglDeleteContext == nullptr || glGetString == nullptr) {
-			printf("Failed loading the system opengl32.dll: The library is invalid.\n");
-			return;
-		}
+        if (wglCreateContext == nullptr || wglMakeCurrent == nullptr || wglDeleteContext == nullptr || glGetString == nullptr) {
+            printf("Failed loading the system opengl32.dll: The library is invalid.\n");
+            return;
+        }
 
         PIXELFORMATDESCRIPTOR pfd =
         {
@@ -149,152 +149,155 @@ protected:
         };
 
         HDC ourWindowHandleToDeviceContext = ::GetDC(hWnd);
-		// Gdi32.dll
-        int letWindowsChooseThisPixelFormat = ::ChoosePixelFormat(ourWindowHandleToDeviceContext, &pfd); 
-		// Gdi32.dll
+        // Gdi32.dll
+        int letWindowsChooseThisPixelFormat = ::ChoosePixelFormat(ourWindowHandleToDeviceContext, &pfd);
+        // Gdi32.dll
         SetPixelFormat(ourWindowHandleToDeviceContext, letWindowsChooseThisPixelFormat, &pfd);
-		// Opengl32.dll
+        // Opengl32.dll
         HGLRC glcontext = wglCreateContext(ourWindowHandleToDeviceContext);
         wglMakeCurrent(ourWindowHandleToDeviceContext, glcontext);
         // Opengl32.dll
-	    const char *data = (const char*)glGetString(GL_VERSION);
-	    if (data != nullptr)
-	        this->version = data;
-		// printf("check -version: %s\n", version.c_str());
-		data = (const char*)glGetString(0x8B8C); // GL_SHADING_LANGUAGE_VERSION
-    	if (data != nullptr)
-        	this->glsl_version = data;
-    	data = (const char*)glGetString(GL_VENDOR);
-    	if (data != nullptr)
-        	this->vendor = data;
-    	data = (const char*)glGetString(GL_RENDERER);
-    	if (data != nullptr)
-        	this->renderer = data;
+        const char *data = (const char*)glGetString(GL_VERSION);
+        if (data != nullptr)
+            this->version = data;
+        // printf("check -version: %s\n", version.c_str());
+        data = (const char*)glGetString(0x8B8C); // GL_SHADING_LANGUAGE_VERSION
+        if (data != nullptr)
+            this->glsl_version = data;
+        data = (const char*)glGetString(GL_VENDOR);
+        if (data != nullptr)
+            this->vendor = data;
+        data = (const char*)glGetString(GL_RENDERER);
+        if (data != nullptr)
+            this->renderer = data;
         // Opengl32.dll
         wglDeleteContext(glcontext);
-		::ReleaseDC(hWnd, ourWindowHandleToDeviceContext);
+        ::ReleaseDC(hWnd, ourWindowHandleToDeviceContext);
         this->success = true;
-	}
+    }
 
-	static LRESULT CALLBACK supports_opengl2_wndproc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
-	{
-	    switch(message)
-	    {
-	    case WM_CREATE:
-		{
-			CREATESTRUCT *pCreate = reinterpret_cast<CREATESTRUCT*>(lParam);
-			OpenGLVersionCheck *ogl_data = reinterpret_cast<OpenGLVersionCheck*>(pCreate->lpCreateParams);
-			ogl_data->check(hWnd);
-			DestroyWindow(hWnd);
-			return 0;
-	    }
-		case WM_NCDESTROY:
-			message_pump_exit = true;
-			return 0;
-	    default:
-	        return DefWindowProc(hWnd, message, wParam, lParam);
-	    }
-	}
+    static LRESULT CALLBACK supports_opengl2_wndproc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+    {
+        switch(message)
+        {
+        case WM_CREATE:
+        {
+            CREATESTRUCT *pCreate = reinterpret_cast<CREATESTRUCT*>(lParam);
+            OpenGLVersionCheck *ogl_data = reinterpret_cast<OpenGLVersionCheck*>(pCreate->lpCreateParams);
+            ogl_data->check(hWnd);
+            DestroyWindow(hWnd);
+            return 0;
+        }
+        case WM_NCDESTROY:
+            message_pump_exit = true;
+            return 0;
+        default:
+            return DefWindowProc(hWnd, message, wParam, lParam);
+        }
+    }
 };
 
 bool OpenGLVersionCheck::message_pump_exit = false;
 #endif /* SLIC3R_GUI */
 
 extern "C" {
-	typedef int (__stdcall *Slic3rMainFunc)(int argc, wchar_t **argv);
-	Slic3rMainFunc slic3r_main = nullptr;
+    typedef int (__stdcall *Slic3rMainFunc)(int argc, wchar_t **argv);
+    Slic3rMainFunc slic3r_main = nullptr;
 }
 
+extern "C" {
+
 #ifdef SLIC3R_WRAPPER_NOCONSOLE
 int APIENTRY wWinMain(HINSTANCE /* hInstance */, HINSTANCE /* hPrevInstance */, PWSTR /* lpCmdLine */, int /* nCmdShow */)
 {
-	int 	  argc;
-	wchar_t **argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);
+    int 	  argc;
+    wchar_t **argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);
 #else
 int wmain(int argc, wchar_t **argv)
 {
 #endif
 
-	std::vector<wchar_t*> argv_extended;
-	argv_extended.emplace_back(argv[0]);
+    std::vector<wchar_t*> argv_extended;
+    argv_extended.emplace_back(argv[0]);
 
 #ifdef SLIC3R_GUI
-	// Here one may push some additional parameters based on the wrapper type.
-	bool force_mesa = false;
+    // Here one may push some additional parameters based on the wrapper type.
+    bool force_mesa = false;
 #endif /* SLIC3R_GUI */
-	for (int i = 1; i < argc; ++ i) {
+    for (int i = 1; i < argc; ++ i) {
 #ifdef SLIC3R_GUI
-		if (wcscmp(argv[i], L"--sw-renderer") == 0)
-			force_mesa = true;
-		else if (wcscmp(argv[i], L"--no-sw-renderer") == 0)
-			force_mesa = false;
+        if (wcscmp(argv[i], L"--sw-renderer") == 0)
+            force_mesa = true;
+        else if (wcscmp(argv[i], L"--no-sw-renderer") == 0)
+            force_mesa = false;
 #endif /* SLIC3R_GUI */
-		argv_extended.emplace_back(argv[i]);
-	}
-	argv_extended.emplace_back(nullptr);
+        argv_extended.emplace_back(argv[i]);
+    }
+    argv_extended.emplace_back(nullptr);
 
 #ifdef SLIC3R_GUI
-	OpenGLVersionCheck opengl_version_check;
-	bool load_mesa = 
-		// Forced from the command line.
-		force_mesa ||
-		// Running over a rempote desktop, and the RemoteFX is not enabled, therefore Windows will only provide SW OpenGL 1.1 context.
-		// In that case, use Mesa.
-		::GetSystemMetrics(SM_REMOTESESSION) ||
-		// Try to load the default OpenGL driver and test its context version.
-		! opengl_version_check.load_opengl_dll() || ! opengl_version_check.is_version_greater_or_equal_to(2, 0);
+    OpenGLVersionCheck opengl_version_check;
+    bool load_mesa =
+        // Forced from the command line.
+        force_mesa ||
+        // Running over a rempote desktop, and the RemoteFX is not enabled, therefore Windows will only provide SW OpenGL 1.1 context.
+        // In that case, use Mesa.
+        ::GetSystemMetrics(SM_REMOTESESSION) ||
+        // Try to load the default OpenGL driver and test its context version.
+        ! opengl_version_check.load_opengl_dll() || ! opengl_version_check.is_version_greater_or_equal_to(2, 0);
 #endif /* SLIC3R_GUI */
 
-	wchar_t path_to_exe[MAX_PATH + 1] = { 0 };
-	::GetModuleFileNameW(nullptr, path_to_exe, MAX_PATH);
-	wchar_t drive[_MAX_DRIVE];
-	wchar_t dir[_MAX_DIR];
-	wchar_t fname[_MAX_FNAME];
-	wchar_t ext[_MAX_EXT];
-	_wsplitpath(path_to_exe, drive, dir, fname, ext);
-	_wmakepath(path_to_exe, drive, dir, nullptr, nullptr);
+    wchar_t path_to_exe[MAX_PATH + 1] = { 0 };
+    ::GetModuleFileNameW(nullptr, path_to_exe, MAX_PATH);
+    wchar_t drive[_MAX_DRIVE];
+    wchar_t dir[_MAX_DIR];
+    wchar_t fname[_MAX_FNAME];
+    wchar_t ext[_MAX_EXT];
+    _wsplitpath(path_to_exe, drive, dir, fname, ext);
+    _wmakepath(path_to_exe, drive, dir, nullptr, nullptr);
 
 #ifdef SLIC3R_GUI
 // https://wiki.qt.io/Cross_compiling_Mesa_for_Windows
 // http://download.qt.io/development_releases/prebuilt/llvmpipe/windows/
-	if (load_mesa) {
-		opengl_version_check.unload_opengl_dll();
-		wchar_t path_to_mesa[MAX_PATH + 1] = { 0 };
-		wcscpy(path_to_mesa, path_to_exe);
-		wcscat(path_to_mesa, L"mesa\\opengl32.dll");
-		printf("Loading MESA OpenGL library: %S\n", path_to_mesa);
-		HINSTANCE hInstance_OpenGL = LoadLibraryExW(path_to_mesa, nullptr, 0);
-		if (hInstance_OpenGL == nullptr) {
-			printf("MESA OpenGL library was not loaded\n");
-		} else
-			printf("MESA OpenGL library was loaded sucessfully\n");		
-	}
+    if (load_mesa) {
+        opengl_version_check.unload_opengl_dll();
+        wchar_t path_to_mesa[MAX_PATH + 1] = { 0 };
+        wcscpy(path_to_mesa, path_to_exe);
+        wcscat(path_to_mesa, L"mesa\\opengl32.dll");
+        printf("Loading MESA OpenGL library: %S\n", path_to_mesa);
+        HINSTANCE hInstance_OpenGL = LoadLibraryExW(path_to_mesa, nullptr, 0);
+        if (hInstance_OpenGL == nullptr) {
+            printf("MESA OpenGL library was not loaded\n");
+        } else
+            printf("MESA OpenGL library was loaded sucessfully\n");
+    }
 #endif /* SLIC3R_GUI */
 
 
-	wchar_t path_to_slic3r[MAX_PATH + 1] = { 0 };
-	wcscpy(path_to_slic3r, path_to_exe);
-	wcscat(path_to_slic3r, L"PrusaSlicer.dll");
+    wchar_t path_to_slic3r[MAX_PATH + 1] = { 0 };
+    wcscpy(path_to_slic3r, path_to_exe);
+    wcscat(path_to_slic3r, L"PrusaSlicer.dll");
 //	printf("Loading Slic3r library: %S\n", path_to_slic3r);
-	HINSTANCE hInstance_Slic3r = LoadLibraryExW(path_to_slic3r, nullptr, 0);
-	if (hInstance_Slic3r == nullptr) {
-		printf("PrusaSlicer.dll was not loaded\n");
-		return -1;
-	}
+    HINSTANCE hInstance_Slic3r = LoadLibraryExW(path_to_slic3r, nullptr, 0);
+    if (hInstance_Slic3r == nullptr) {
+        printf("PrusaSlicer.dll was not loaded\n");
+        return -1;
+    }
 
-	// resolve function address here
-	slic3r_main = (Slic3rMainFunc)GetProcAddress(hInstance_Slic3r, 
+    // resolve function address here
+    slic3r_main = (Slic3rMainFunc)GetProcAddress(hInstance_Slic3r,
 #ifdef _WIN64
-		// there is just a single calling conversion, therefore no mangling of the function name.
-		"slic3r_main"
+        // there is just a single calling conversion, therefore no mangling of the function name.
+        "slic3r_main"
 #else	// stdcall calling convention declaration
-		"_slic3r_main@8"
+        "_slic3r_main@8"
 #endif
-		);
-	if (slic3r_main == nullptr) {
-		printf("could not locate the function slic3r_main in PrusaSlicer.dll\n");
-		return -1;
-	}
-	// argc minus the trailing nullptr of the argv
-	return slic3r_main((int)argv_extended.size() - 1, argv_extended.data());
+        );
+    if (slic3r_main == nullptr) {
+        printf("could not locate the function slic3r_main in PrusaSlicer.dll\n");
+        return -1;
+    }
+    // argc minus the trailing nullptr of the argv
+    return slic3r_main((int)argv_extended.size() - 1, argv_extended.data());
+}
 }
diff --git a/src/avrdude/CMakeLists.txt b/src/avrdude/CMakeLists.txt
index 0e9b9e6d4d..8897200211 100644
--- a/src/avrdude/CMakeLists.txt
+++ b/src/avrdude/CMakeLists.txt
@@ -74,6 +74,10 @@ if (MSVC)
         windows/unistd.cpp
         windows/getopt.c
     )
+elseif (MINGW)
+    set(AVRDUDE_SOURCES ${AVRDUDE_SOURCES}
+        windows/utf8.c
+    )
 endif()
 
 add_executable(avrdude-conf-gen conf-generate.cpp)
@@ -81,13 +85,13 @@ add_executable(avrdude-conf-gen conf-generate.cpp)
 # Config file embedding
 add_custom_command(
     DEPENDS avrdude-conf-gen ${CMAKE_CURRENT_SOURCE_DIR}/avrdude-slic3r.conf
-    OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/avrdude-slic3r.conf.h
-    COMMAND $<TARGET_FILE:avrdude-conf-gen> avrdude-slic3r.conf avrdude_slic3r_conf > avrdude-slic3r.conf.h
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/avrdude-slic3r.conf.h
+    COMMAND $<TARGET_FILE:avrdude-conf-gen> avrdude-slic3r.conf avrdude_slic3r_conf ${CMAKE_CURRENT_BINARY_DIR}/avrdude-slic3r.conf.h
     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
 )
 
 add_custom_target(gen_conf_h
-   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/avrdude-slic3r.conf.h
+   DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/avrdude-slic3r.conf.h
 )
 
 add_library(avrdude STATIC ${AVRDUDE_SOURCES})
@@ -96,7 +100,15 @@ add_dependencies(avrdude gen_conf_h)
 add_executable(avrdude-slic3r main-standalone.cpp)
 target_link_libraries(avrdude-slic3r avrdude)
 
+encoding_check(avrdude)
+encoding_check(avrdude-slic3r)
+
+# Make avrdude-slic3r.conf.h includable:
+target_include_directories(avrdude SYSTEM PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+
 if (WIN32)
     target_compile_definitions(avrdude PRIVATE WIN32NATIVE=1)
-    target_include_directories(avrdude SYSTEM PRIVATE windows)    # So that sources find the getopt.h windows drop-in
+    if(MSVC)
+        target_include_directories(avrdude SYSTEM PRIVATE windows)    # So that sources find the getopt.h windows drop-in
+    endif(MSVC)
 endif()
diff --git a/src/avrdude/avrdude-slic3r.conf.h b/src/avrdude/avrdude-slic3r.conf.h
deleted file mode 100644
index 905b14ee8c..0000000000
--- a/src/avrdude/avrdude-slic3r.conf.h
+++ /dev/null
@@ -1,1188 +0,0 @@
-/* WARN: This file is auto-generated from `avrdude-slic3r.conf` */
-const unsigned char avrdude_slic3r_conf[] = {
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-    0x20, 0x20, 0x6f, 0x20, 0x20, 0x6f, 0x20, 0x20, 0x6f, 0x20, 0x20, 0x6f, 
-    0x20, 0x20, 0x20, 0x6f, 0x20, 0x20, 0x6f, 0x20, 0x20, 0x6f, 0x20, 0x20, 
-    0x6f, 0x22, 0x3b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x3b, 0x0a, 
-    0x20, 0x20, 0x3b, 0x0a, 0x0a, 0x0a, 
-    0, 0
-};
-const size_t avrdude_slic3r_conf_size = 14178;
-const size_t avrdude_slic3r_conf_size_yy = 14180;
diff --git a/src/avrdude/conf-generate.cpp b/src/avrdude/conf-generate.cpp
index 4aa80ae0af..e61f42eb4b 100644
--- a/src/avrdude/conf-generate.cpp
+++ b/src/avrdude/conf-generate.cpp
@@ -6,36 +6,42 @@
 
 int main(int argc, char const *argv[])
 {
-    if (argc != 3) {
-        std::cerr << "Usage: " << argv[0] << " <file> <symbol name>" << std::endl;
+    if (argc != 4) {
+        std::cerr << "Usage: " << argv[0] << " <file> <symbol name> <output file>" << std::endl;
         return -1;
     }
 
-    const char* filename = argv[1];
+    const char* filename_in = argv[1];
     const char* symbol = argv[2];
+    const char* filename_out = argv[3];
 
     size_t size = 0;
-    std::fstream file(filename);
+    std::fstream file(filename_in, std::ios::in | std::ios::binary);
     if (!file.good()) {
-        std::cerr << "Cannot read file: " << filename << std::endl;
+        std::cerr << "Cannot read file: " << filename_in << std::endl;
     }
 
-    std::cout << "/* WARN: This file is auto-generated from `" << filename << "` */" << std::endl;
-    std::cout << "const unsigned char " << symbol << "[] = {";
+    std::fstream output(filename_out, std::ios::out | std::ios::trunc);
+    if (!output.good()) {
+        std::cerr << "Cannot open output file: " << filename_out << std::endl;
+    }
+
+    output << "/* WARN: This file is auto-generated from `" << filename_in << "` */" << std::endl;
+    output << "const unsigned char " << symbol << "[] = {";
 
     char c;
-    std::cout << std::hex;
-    std::cout.fill('0');
+    output << std::hex;
+    output.fill('0');
     for (file.get(c); !file.eof(); size++, file.get(c)) {
-        if (size % 12 == 0) { std::cout << "\n    "; }
-        std::cout << "0x" << std::setw(2) << (unsigned)c << ", ";
+        if (size % 12 == 0) { output << "\n    "; }
+        output << "0x" << std::setw(2) << (unsigned)c << ", ";
     }
 
-    std::cout << "\n    0, 0\n};\n";
+    output << "\n    0, 0\n};\n";
 
-    std::cout << std::dec;
-    std::cout << "const size_t " << symbol << "_size = " << size << ";" << std::endl;
-    std::cout << "const size_t " << symbol << "_size_yy = " << size + 2 << ";" << std::endl;
+    output << std::dec;
+    output << "const size_t " << symbol << "_size = " << size << ";" << std::endl;
+    output << "const size_t " << symbol << "_size_yy = " << size + 2 << ";" << std::endl;
 
     return 0;
 }
diff --git a/src/avrdude/lexer.c b/src/avrdude/lexer.c
index f2d8adb4bc..46d88170f5 100644
--- a/src/avrdude/lexer.c
+++ b/src/avrdude/lexer.c
@@ -30,7 +30,7 @@
 
 /* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
 
-#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+#if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(_MSC_VER)
 
 /* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
  * if you want the limit (max/min) macros for int types. 
diff --git a/src/avrdude/main-standalone.cpp b/src/avrdude/main-standalone.cpp
index df6d79e136..f7cd6d1d4a 100644
--- a/src/avrdude/main-standalone.cpp
+++ b/src/avrdude/main-standalone.cpp
@@ -38,6 +38,10 @@ struct ArgvUtf8 : std::vector<char*>
 	}
 };
 
+#endif
+
+#ifdef _MSC_VER
+
 int wmain(int argc_w, wchar_t *argv_w[])
 {
 	ArgvUtf8 argv_utf8(argc_w, argv_w);
diff --git a/src/avrdude/windows/unistd.h b/src/avrdude/windows/unistd.h
index 95ba79a346..c88b780bfa 100644
--- a/src/avrdude/windows/unistd.h
+++ b/src/avrdude/windows/unistd.h
@@ -63,10 +63,15 @@ extern "C" {
 #define STDOUT_FILENO 1
 #define STDERR_FILENO 2
 
+#if defined(_MSC_VER) && defined(__clang__)
+#include <stdint.h>
+struct timezone;
+struct timeval;
+#else
 #ifndef __cplusplus
 /* should be in some equivalent to <sys/types.h> */
 typedef __int8            int8_t;
-typedef __int16           int16_t; 
+typedef __int16           int16_t;
 typedef __int32           int32_t;
 typedef __int64           int64_t;
 typedef unsigned __int8   uint8_t;
@@ -74,6 +79,7 @@ typedef unsigned __int16  uint16_t;
 typedef unsigned __int32  uint32_t;
 typedef unsigned __int64  uint64_t;
 #endif
+#endif
 
 
 int usleep(unsigned usec);
diff --git a/src/build-utils/CMakeLists.txt b/src/build-utils/CMakeLists.txt
new file mode 100644
index 0000000000..3b3961b562
--- /dev/null
+++ b/src/build-utils/CMakeLists.txt
@@ -0,0 +1,39 @@
+
+add_executable(encoding-check encoding-check.cpp)
+
+# A global no-op target which depends on all encodings checks,
+# and on which in turn all checked targets depend.
+# This is done to make encoding checks the first thing to be
+# performed before actually compiling any sources of the checked targets
+# to make the check fail as early as possible.
+add_custom_target(global-encoding-check
+    ALL
+    DEPENDS encoding-check
+)
+
+# Function that adds source file encoding check to a target
+# using the above encoding-check binary
+
+function(encoding_check TARGET)
+    # Obtain target source files
+    get_target_property(T_SOURCES ${TARGET} SOURCES)
+
+    # Define top-level encoding check target for this ${TARGET}
+    add_custom_target(encoding-check-${TARGET}
+        DEPENDS encoding-check ${T_SOURCES}
+        COMMENT "Checking source files encodings for target ${TARGET}"
+    )
+
+    # Add checking of each source file as a subcommand of encoding-check-${TARGET}
+    foreach(file ${T_SOURCES})
+        add_custom_command(TARGET encoding-check-${TARGET}
+            COMMAND $<TARGET_FILE:encoding-check> ${TARGET} ${file}
+            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        )
+    endforeach()
+
+    # This adds dependency on encoding-check-${TARGET} to ${TARET}
+    # via the global-encoding-check
+    add_dependencies(global-encoding-check encoding-check-${TARGET})
+    add_dependencies(${TARGET} global-encoding-check)
+endfunction()
diff --git a/src/build-utils/encoding-check.cpp b/src/build-utils/encoding-check.cpp
new file mode 100644
index 0000000000..89f225572b
--- /dev/null
+++ b/src/build-utils/encoding-check.cpp
@@ -0,0 +1,119 @@
+#include <vector>
+#include <iostream>
+#include <fstream>
+#include <cstdlib>
+
+
+/*
+ * The utf8_check() function scans the '\0'-terminated string starting
+ * at s. It returns a pointer to the first byte of the first malformed
+ * or overlong UTF-8 sequence found, or NULL if the string contains
+ * only correct UTF-8. It also spots UTF-8 sequences that could cause
+ * trouble if converted to UTF-16, namely surrogate characters
+ * (U+D800..U+DFFF) and non-Unicode positions (U+FFFE..U+FFFF). This
+ * routine is very likely to find a malformed sequence if the input
+ * uses any other encoding than UTF-8. It therefore can be used as a
+ * very effective heuristic for distinguishing between UTF-8 and other
+ * encodings.
+ *
+ * I wrote this code mainly as a specification of functionality; there
+ * are no doubt performance optimizations possible for certain CPUs.
+ *
+ * Markus Kuhn <http://www.cl.cam.ac.uk/~mgk25/> -- 2005-03-30
+ * License: http://www.cl.cam.ac.uk/~mgk25/short-license.html
+ */
+
+unsigned char *utf8_check(unsigned char *s)
+{
+    while (*s) {
+        if (*s < 0x80) {
+            // 0xxxxxxx
+            s++;
+        } else if ((s[0] & 0xe0) == 0xc0) {
+            // 110xxxxx 10xxxxxx
+            if ((s[1] & 0xc0) != 0x80 ||
+                (s[0] & 0xfe) == 0xc0) {         // overlong?
+                return s;
+            } else {
+                s += 2;
+            }
+        } else if ((s[0] & 0xf0) == 0xe0) {
+            // 1110xxxx 10xxxxxx 10xxxxxx
+            if ((s[1] & 0xc0) != 0x80 ||
+                (s[2] & 0xc0) != 0x80 ||
+                (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) || // overlong?
+                (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) || // surrogate?
+                (s[0] == 0xef && s[1] == 0xbf &&
+                (s[2] & 0xfe) == 0xbe)) {                  // U+FFFE or U+FFFF?
+                return s;
+            } else {
+                s += 3;
+            }
+        } else if ((s[0] & 0xf8) == 0xf0) {
+            // 11110xxX 10xxxxxx 10xxxxxx 10xxxxxx
+            if ((s[1] & 0xc0) != 0x80 ||
+                (s[2] & 0xc0) != 0x80 ||
+                (s[3] & 0xc0) != 0x80 ||
+                (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) ||      // overlong?
+                (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4) { // > U+10FFFF?
+                return s;
+            } else {
+                s += 4;
+            }
+        } else {
+            return s;
+        }
+    }
+
+    return NULL;
+}
+
+
+int main(int argc, char const *argv[])
+{
+    if (argc != 3) {
+        std::cerr << "Usage: " << argv[0] << " <program/library> <file>" << std::endl;
+        return -1;
+    }
+
+    const char* target = argv[1];
+    const char* filename = argv[2];
+
+    const auto error_exit = [=](const char* error) {
+        std::cerr << "\n\tError: " << error << ": " << filename << "\n"
+            << "\tTarget: " << target << "\n"
+            << std::endl;
+        std::exit(-2);
+    };
+
+    std::ifstream file(filename, std::ios::binary | std::ios::ate);
+    const auto size = file.tellg();
+
+    if (size == 0) {
+        return 0;
+    }
+
+    file.seekg(0, std::ios::beg);
+    std::vector<char> buffer(size);
+
+    if (file.read(buffer.data(), size)) {
+        buffer.push_back('\0');
+
+        // Check UTF-8 validity
+        if (utf8_check(reinterpret_cast<unsigned char*>(buffer.data())) != nullptr) {
+            error_exit("Source file does not contain (valid) UTF-8");
+        }
+
+        // Check against a BOM mark
+        if (buffer.size() >= 3
+            && buffer[0] == '\xef'
+            && buffer[1] == '\xbb'
+            && buffer[2] == '\xbf') {
+            error_exit("Source file is valid UTF-8 but contains a BOM mark");
+        }
+    } else {
+        error_exit("Could not read source file");
+    }
+
+    return 0;
+}
diff --git a/src/libigl/igl/SortableRow.h b/src/libigl/igl/SortableRow.h
index 5f172987bf..182bf81343 100644
--- a/src/libigl/igl/SortableRow.h
+++ b/src/libigl/igl/SortableRow.h
@@ -1,9 +1,9 @@
 // This file is part of libigl, a simple c++ geometry processing library.
-// 
+//
 // Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
-// 
-// This Source Code Form is subject to the terms of the Mozilla Public License 
-// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can
 // obtain one at http://mozilla.org/MPL/2.0/.
 #ifndef IGL_SORTABLE_ROW_H
 #define IGL_SORTABLE_ROW_H
@@ -14,57 +14,53 @@
 
 namespace igl
 {
-  // Templates:
-  //   T  should be a matrix that implements .size(), and operator(int i)
-  template <typename T>
-  class SortableRow
-  {
-    public:
-      T data;
-    public:
-      SortableRow():data(){};
-      SortableRow(const T & data):data(data){};
-      bool operator<(const SortableRow & that) const
-      {
-        // Get reference so that I can use parenthesis
-        const SortableRow<T> & THIS = *this;
+// Templates:
+//   T  should be a matrix that implements .size(), and operator(int i)
+template <typename T>
+class SortableRow
+{
+public:
+    T data;
+public:
+    SortableRow():data(){};
+    SortableRow(const T & data):data(data){};
+    bool operator<(const SortableRow & that) const
+    {
         // Lexicographical
-        int minc = (THIS.data.size() < that.data.size()? 
-            THIS.data.size() : that.data.size());
+        int minc = (this->data.size() < that.data.size()?
+                        this->data.size() : that.data.size());
         // loop over columns
         for(int i = 0;i<minc;i++)
         {
-          if(THIS.data(i) == that.data(i))
-          {
-            continue;
-          }
-          return THIS.data(i) < that.data(i);
+            if(this->data(i) == that.data(i))
+            {
+                continue;
+            }
+            return this->data(i) < that.data(i);
         }
         // All characters the same, comes done to length
-        return THIS.data.size()<that.data.size();
-      };
-      bool operator==(const SortableRow & that) const
-      {
-        // Get reference so that I can use parenthesis
-        const SortableRow<T> & THIS = *this;
-        if(THIS.data.size() != that.data.size())
+        return this->data.size()<that.data.size();
+    };
+    bool operator==(const SortableRow & that) const
+    {
+        if(this->data.size() != that.data.size())
         {
-          return false;
-        }
-        for(int i = 0;i<THIS.data.size();i++)
-        {
-          if(THIS.data(i) != that.data(i))
-          {
             return false;
-          }
+        }
+        for(int i = 0;i<this->data.size();i++)
+        {
+            if(this->data(i) != that.data(i))
+            {
+                return false;
+            }
         }
         return true;
-      };
-      bool operator!=(const SortableRow & that) const
-      {
+    };
+    bool operator!=(const SortableRow & that) const
+    {
         return !(*this == that);
-      };
-  };
+    };
+};
 }
 
 #endif
diff --git a/src/libigl/igl/ray_box_intersect.cpp b/src/libigl/igl/ray_box_intersect.cpp
index 8c6346d86d..088273f255 100644
--- a/src/libigl/igl/ray_box_intersect.cpp
+++ b/src/libigl/igl/ray_box_intersect.cpp
@@ -1,12 +1,12 @@
 // This file is part of libigl, a simple c++ geometry processing library.
-// 
+//
 // Copyright (C) 2016 Alec Jacobson <alecjacobson@gmail.com>
-// 
-// This Source Code Form is subject to the terms of the Mozilla Public License 
-// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can
 // obtain one at http://mozilla.org/MPL/2.0/.
 #include "ray_box_intersect.h"
-#include <vector>
+#include <array>
 
 template <
   typename Derivedsource,
@@ -27,7 +27,7 @@ IGL_INLINE bool igl::ray_box_intersect(
     const Eigen::Vector3f& rayo,
     const Eigen::Vector3f& rayd,
     const Eigen::Vector3f& bmin,
-    const Eigen::Vector3f& bmax, 
+    const Eigen::Vector3f& bmax,
     float & tnear,
     float & tfar
     )->bool
@@ -35,12 +35,12 @@ IGL_INLINE bool igl::ray_box_intersect(
     Eigen::Vector3f bnear;
     Eigen::Vector3f bfar;
     // Checks for intersection testing on each direction coordinate
-    // Computes 
+    // Computes
     float t1, t2;
     tnear = -1e+6f, tfar = 1e+6f; //, tCube;
     bool intersectFlag = true;
     for (int i = 0; i < 3; ++i) {
-  //    std::cout << "coordinate " << i << ": bmin " << bmin(i) << ", bmax " << bmax(i) << std::endl; 
+  //    std::cout << "coordinate " << i << ": bmin " << bmin(i) << ", bmax " << bmax(i) << std::endl;
       assert(bmin(i) <= bmax(i));
       if (::fabs(rayd(i)) < 1e-6) {   // Ray parallel to axis i-th
         if (rayo(i) < bmin(i) || rayo(i) > bmax(i)) {
@@ -59,12 +59,12 @@ IGL_INLINE bool igl::ray_box_intersect(
         }
   //      std::cout << "  bnear " << bnear(i) << ", bfar " << bfar(i) << std::endl;
         // Finds the distance parameters t1 and t2 of the two ray-box intersections:
-        // t1 must be the closest to the ray origin rayo. 
+        // t1 must be the closest to the ray origin rayo.
         t1 = (bnear(i) - rayo(i)) / rayd(i);
         t2 = (bfar(i) - rayo(i)) / rayd(i);
         if (t1 > t2) {
           std::swap(t1,t2);
-        } 
+        }
         // The two intersection values are used to saturate tnear and tfar
         if (t1 > tnear) {
           tnear = t1;
@@ -72,7 +72,7 @@ IGL_INLINE bool igl::ray_box_intersect(
         if (t2 < tfar) {
           tfar = t2;
         }
-  //      std::cout << "  t1 " << t1 << ", t2 " << t2 << ", tnear " << tnear << ", tfar " << tfar 
+  //      std::cout << "  t1 " << t1 << ", t2 " << t2 << ", tnear " << tnear << ", tfar " << tfar
   //        << "  tnear > tfar? " << (tnear > tfar) << ", tfar < 0? " << (tfar < 0) << std::endl;
         if(tnear > tfar) {
           intersectFlag = false;
@@ -101,11 +101,11 @@ IGL_INLINE bool igl::ray_box_intersect(
   // This should be precomputed and provided as input
   typedef Matrix<Scalar,1,3>  RowVector3S;
   const RowVector3S inv_dir( 1./dir(0),1./dir(1),1./dir(2));
-  const std::vector<bool> sign = { inv_dir(0)<0, inv_dir(1)<0, inv_dir(2)<0};
+  const std::array<bool, 3> sign = { inv_dir(0)<0, inv_dir(1)<0, inv_dir(2)<0};
   // http://people.csail.mit.edu/amy/papers/box-jgt.pdf
   // "An Efficient and Robust Ray–Box Intersection Algorithm"
   Scalar tymin, tymax, tzmin, tzmax;
-  std::vector<RowVector3S> bounds = {box.min(),box.max()};
+  std::array<RowVector3S, 2> bounds = {box.min(),box.max()};
   tmin = ( bounds[sign[0]](0)   - origin(0)) * inv_dir(0);
   tmax = ( bounds[1-sign[0]](0) - origin(0)) * inv_dir(0);
   tymin = (bounds[sign[1]](1)   - origin(1)) * inv_dir(1);
@@ -146,4 +146,4 @@ IGL_INLINE bool igl::ray_box_intersect(
 
 #ifdef IGL_STATIC_LIBRARY
 template bool igl::ray_box_intersect<Eigen::Matrix<double, 1, 3, 1, 1, 3>, Eigen::Matrix<double, 1, 3, 1, 1, 3>, double>(Eigen::MatrixBase<Eigen::Matrix<double, 1, 3, 1, 1, 3> > const&, Eigen::MatrixBase<Eigen::Matrix<double, 1, 3, 1, 1, 3> > const&, Eigen::AlignedBox<double, 3> const&, double const&, double const&, double&, double&);
-#endif
\ No newline at end of file
+#endif
diff --git a/src/libigl/igl/ray_mesh_intersect.cpp b/src/libigl/igl/ray_mesh_intersect.cpp
index 512a35c461..18060fbadb 100644
--- a/src/libigl/igl/ray_mesh_intersect.cpp
+++ b/src/libigl/igl/ray_mesh_intersect.cpp
@@ -29,7 +29,9 @@ IGL_INLINE bool igl::ray_mesh_intersect(
   // Should be but can't be const 
   Vector3d s_d = s.template cast<double>();
   Vector3d dir_d = dir.template cast<double>();
-  hits.clear();
+  hits.clear(); 
+  hits.reserve(F.rows());
+
   // loop over all triangles
   for(int f = 0;f<F.rows();f++)
   {
diff --git a/src/libnest2d/include/libnest2d/backends/clipper/geometries.hpp b/src/libnest2d/include/libnest2d/backends/clipper/geometries.hpp
index 06afbd1872..56330e15e7 100644
--- a/src/libnest2d/include/libnest2d/backends/clipper/geometries.hpp
+++ b/src/libnest2d/include/libnest2d/backends/clipper/geometries.hpp
@@ -337,7 +337,15 @@ merge(const TMultiShape<PolygonImpl>& shapes)
 //#define DISABLE_BOOST_SERIALIZE
 //#define DISABLE_BOOST_UNSERIALIZE
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4244)
+#pragma warning(disable: 4267)
+#endif
 // All other operators and algorithms are implemented with boost
 #include <libnest2d/utils/boost_alg.hpp>
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
 
 #endif // CLIPPER_BACKEND_HPP
diff --git a/src/libnest2d/tests/test.cpp b/src/libnest2d/tests/test.cpp
index 29577344d1..4a6691415f 100644
--- a/src/libnest2d/tests/test.cpp
+++ b/src/libnest2d/tests/test.cpp
@@ -7,6 +7,10 @@
 #include "../tools/svgtools.hpp"
 #include <libnest2d/utils/rotcalipers.hpp>
 
+#if defined(_MSC_VER) && defined(__clang__)
+#define BOOST_NO_CXX17_HDR_STRING_VIEW
+#endif
+
 #include "boost/multiprecision/integer.hpp"
 #include "boost/rational.hpp"
 
diff --git a/src/libslic3r/Arrange.cpp b/src/libslic3r/Arrange.cpp
index 76ad81e299..34e07302a0 100644
--- a/src/libslic3r/Arrange.cpp
+++ b/src/libslic3r/Arrange.cpp
@@ -12,6 +12,11 @@
 #include <ClipperUtils.hpp>
 
 #include <boost/geometry/index/rtree.hpp>
+
+#if defined(_MSC_VER) && defined(__clang__)
+#define BOOST_NO_CXX17_HDR_STRING_VIEW
+#endif
+
 #include <boost/multiprecision/integer.hpp>
 #include <boost/rational.hpp>
 
@@ -128,13 +133,24 @@ protected:
     PConfig   m_pconf; // Placement configuration
     TBin      m_bin;
     double    m_bin_area;
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4244)
+#pragma warning(disable: 4267)
+#endif
     SpatIndex m_rtree; // spatial index for the normal (bigger) objects
     SpatIndex m_smallsrtree;    // spatial index for only the smaller items
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
     double    m_norm;           // A coefficient to scale distances
     MultiPolygon m_merged_pile; // The already merged pile (vector of items)
     Box          m_pilebb;      // The bounding box of the merged pile.
-    ItemGroup m_remaining; // Remaining items (m_items at the beginning)
-    ItemGroup m_items;     // The items to be packed
+    ItemGroup m_remaining;      // Remaining items
+    ItemGroup m_items;          // allready packed items
+    size_t    m_item_count = 0; // Number of all items to be packed
     
     template<class T> ArithmeticOnly<T, double> norm(T val)
     {
@@ -152,7 +168,6 @@ protected:
         const double bin_area = m_bin_area;
         const SpatIndex& spatindex = m_rtree;
         const SpatIndex& smalls_spatindex = m_smallsrtree;
-        const ItemGroup& remaining = m_remaining;
         
         // We will treat big items (compared to the print bed) differently
         auto isBig = [bin_area](double a) {
@@ -194,8 +209,8 @@ protected:
         } compute_case;
         
         bool bigitems = isBig(item.area()) || spatindex.empty();
-        if(bigitems && !remaining.empty()) compute_case = BIG_ITEM;
-        else if (bigitems && remaining.empty()) compute_case = LAST_BIG_ITEM;
+        if(bigitems && !m_remaining.empty()) compute_case = BIG_ITEM;
+        else if (bigitems && m_remaining.empty()) compute_case = LAST_BIG_ITEM;
         else compute_case = SMALL_ITEM;
         
         switch (compute_case) {
@@ -220,7 +235,7 @@ protected:
             // The smalles distance from the arranged pile center:
             double dist = norm(*(std::min_element(dists.begin(), dists.end())));
             double bindist = norm(pl::distance(ibb.center(), bincenter));
-            dist = 0.8 * dist + 0.2*bindist;
+            dist = 0.8 * dist + 0.2 * bindist;
 
             // Prepare a variable for the alignment score.
             // This will indicate: how well is the candidate item
@@ -252,29 +267,24 @@ protected:
                     if(ascore < alignment_score) alignment_score = ascore;
                 }
             }
-
+            
             density = std::sqrt(norm(fullbb.width()) * norm(fullbb.height()));
-
+            double R = double(m_remaining.size()) / m_item_count;
+            
             // The final mix of the score is the balance between the
             // distance from the full pile center, the pack density and
             // the alignment with the neighbors
             if (result.empty())
-                score = 0.5 * dist + 0.5 * density;
+                score = 0.50 * dist + 0.50 * density;
             else
-                score = 0.40 * dist + 0.40 * density + 0.2 * alignment_score;
+                score = R * 0.60 * dist +
+                        (1.0 - R) * 0.20 * density +
+                        0.20 * alignment_score;
             
             break;
         }
         case LAST_BIG_ITEM: {
-            auto mp = m_merged_pile;
-            mp.emplace_back(item.transformedShape());
-            auto chull = sl::convexHull(mp);
-    
-            placers::EdgeCache<clppr::Polygon> ec(chull);
-            
-            double circ  = norm(ec.circumference());
-            double bcirc = 2.0 * norm(fullbb.width() + fullbb.height());
-            score = 0.5 * circ + 0.5 * bcirc;
+            score = norm(pl::distance(ibb.center(), m_pilebb.center()));
             break;
         }
         case SMALL_ITEM: {
@@ -340,9 +350,11 @@ public:
         m_pck.configure(m_pconf);
     }
     
-    template<class...Args> inline void operator()(Args&&...args) {
-        m_rtree.clear(); /*m_preload_idx.clear();*/
-        m_pck.execute(std::forward<Args>(args)...);
+    template<class It> inline void operator()(It from, It to) {
+        m_rtree.clear();
+        m_item_count += size_t(to - from);
+        m_pck.execute(from, to);
+        m_item_count = 0;
     }
     
     inline void preload(std::vector<Item>& fixeditems) {
@@ -361,6 +373,7 @@ public:
         }
 
         m_pck.configure(m_pconf);
+        m_item_count += fixeditems.size();
     }
 };
 
@@ -424,6 +437,18 @@ inline Circle to_lnCircle(const CircleBed& circ) {
 }
 
 // Get the type of bed geometry from a simple vector of points.
+void BedShapeHint::reset(BedShapes type)
+{
+    if (m_type != type) {
+        if (m_type == bsIrregular)
+            m_bed.polygon.Slic3r::Polyline::~Polyline();
+        else if (type == bsIrregular)
+            ::new (&m_bed.polygon) Polyline();
+    }
+    
+    m_type = type;
+}
+
 BedShapeHint::BedShapeHint(const Polyline &bed) {
     auto x = [](const Point& p) { return p(X); };
     auto y = [](const Point& p) { return p(Y); };
@@ -492,22 +517,50 @@ BedShapeHint::BedShapeHint(const Polyline &bed) {
         m_type = BedShapes::bsCircle;
         m_bed.circ = c;
     } else {
-        if (m_type == BedShapes::bsIrregular)
-             m_bed.polygon.Slic3r::Polyline::~Polyline();
-
+        assert(m_type != BedShapes::bsIrregular);
         m_type = BedShapes::bsIrregular;
         ::new (&m_bed.polygon) Polyline(bed);
     }
 }
 
+BedShapeHint &BedShapeHint::operator=(BedShapeHint &&cpy)
+{
+    reset(cpy.m_type);
+    
+    switch(m_type) {
+    case bsBox: m_bed.box = std::move(cpy.m_bed.box); break;
+    case bsCircle: m_bed.circ = std::move(cpy.m_bed.circ); break;
+    case bsIrregular: m_bed.polygon = std::move(cpy.m_bed.polygon); break;
+    case bsInfinite: m_bed.infbed = std::move(cpy.m_bed.infbed); break;
+    case bsUnknown: break;
+    }
+    
+    return *this;
+}
+
+BedShapeHint &BedShapeHint::operator=(const BedShapeHint &cpy)
+{
+    reset(cpy.m_type);
+    
+    switch(m_type) {
+    case bsBox: m_bed.box = cpy.m_bed.box; break;
+    case bsCircle: m_bed.circ = cpy.m_bed.circ; break;
+    case bsIrregular: m_bed.polygon = cpy.m_bed.polygon; break;
+    case bsInfinite: m_bed.infbed = cpy.m_bed.infbed; break;
+    case bsUnknown: break;
+    }
+    
+    return *this;
+}
+
 template<class BinT> // Arrange for arbitrary bin type
 void _arrange(
-    std::vector<Item> &           shapes,
-    std::vector<Item> &           excludes,
-    const BinT &                  bin,
-    coord_t                       minobjd,
-    std::function<void(unsigned)> prind,
-    std::function<bool()>         stopfn)
+        std::vector<Item> &           shapes,
+        std::vector<Item> &           excludes,
+        const BinT &                  bin,
+        coord_t                       minobjd,
+        std::function<void(unsigned)> prind,
+        std::function<bool()>         stopfn)
 {
     // Integer ceiling the min distance from the bed perimeters
     coord_t md = minobjd - 2 * scaled(0.1 + EPSILON);
diff --git a/src/libslic3r/Arrange.hpp b/src/libslic3r/Arrange.hpp
index 3d405145e6..1cfe1c907d 100644
--- a/src/libslic3r/Arrange.hpp
+++ b/src/libslic3r/Arrange.hpp
@@ -39,6 +39,9 @@ enum BedShapes {
 class BedShapeHint {
     BedShapes m_type = BedShapes::bsInfinite;
     
+    // The union neither calls constructors nor destructors of its members.
+    // The only member with non-trivial constructor / destructor is the polygon,
+    // a placement new / delete needs to be called over it.
     union BedShape_u {  // TODO: use variant from cpp17?
         CircleBed   circ;
         BoundingBox box;
@@ -48,6 +51,9 @@ class BedShapeHint {
         BedShape_u() {}
     } m_bed;
     
+    // Reset the type, allocate m_bed properly
+    void reset(BedShapes type);
+    
 public:
 
     BedShapeHint(){}
@@ -78,33 +84,8 @@ public:
     BedShapeHint(const BedShapeHint &cpy) { *this = cpy; }
     BedShapeHint(BedShapeHint &&cpy) { *this = std::move(cpy); }
 
-    BedShapeHint &operator=(const BedShapeHint &cpy)
-    {
-        m_type = cpy.m_type;
-        switch(m_type) {
-        case bsBox: m_bed.box = cpy.m_bed.box; break;
-        case bsCircle: m_bed.circ = cpy.m_bed.circ; break;
-        case bsIrregular: m_bed.polygon = cpy.m_bed.polygon; break;
-        case bsInfinite: m_bed.infbed = cpy.m_bed.infbed; break;
-        case bsUnknown: break;
-        }
-        
-        return *this;
-    }
-
-    BedShapeHint& operator=(BedShapeHint &&cpy)
-    {
-        m_type = cpy.m_type;
-        switch(m_type) {
-        case bsBox: m_bed.box = std::move(cpy.m_bed.box); break;
-        case bsCircle: m_bed.circ = std::move(cpy.m_bed.circ); break;
-        case bsIrregular: m_bed.polygon = std::move(cpy.m_bed.polygon); break;
-        case bsInfinite: m_bed.infbed = std::move(cpy.m_bed.infbed); break;
-        case bsUnknown: break;
-        }
-        
-        return *this;
-    }
+    BedShapeHint &operator=(const BedShapeHint &cpy);
+    BedShapeHint& operator=(BedShapeHint &&cpy);
     
     BedShapes get_type() const { return m_type; }
 
diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index 4842b51239..85e11eded3 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -5,6 +5,10 @@ include(PrecompiledHeader)
 
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libslic3r_version.h.in ${CMAKE_CURRENT_BINARY_DIR}/libslic3r_version.h @ONLY)
 
+if (MINGW)
+    add_compile_options(-Wa,-mbig-obj)
+endif ()
+
 add_library(libslic3r STATIC
     pchheader.cpp
     pchheader.hpp
@@ -70,7 +74,7 @@ add_library(libslic3r STATIC
     GCode/CoolingBuffer.cpp
     GCode/CoolingBuffer.hpp
     GCode/PostProcessor.cpp
-    GCode/PostProcessor.hpp    
+    GCode/PostProcessor.hpp
 #    GCode/PressureEqualizer.cpp
 #    GCode/PressureEqualizer.hpp
     GCode/PreviewData.cpp
@@ -123,6 +127,8 @@ add_library(libslic3r STATIC
     Point.hpp
     Polygon.cpp
     Polygon.hpp
+    PolygonTrimmer.cpp
+    PolygonTrimmer.hpp
     Polyline.cpp
     Polyline.hpp
     PolylineCollection.cpp
@@ -135,6 +141,7 @@ add_library(libslic3r STATIC
     PrintConfig.hpp
     PrintObject.cpp
     PrintRegion.cpp
+    Semver.cpp
     SLAPrint.cpp
     SLAPrint.hpp
     SLA/SLAAutoSupports.hpp
@@ -182,6 +189,8 @@ add_library(libslic3r STATIC
     SLA/SLARasterWriter.cpp
 )
 
+encoding_check(libslic3r)
+
 if (SLIC3R_PCH AND NOT SLIC3R_SYNTAXONLY)
     add_precompiled_header(libslic3r pchheader.hpp FORCEINCLUDE)
 endif ()
diff --git a/src/libslic3r/EdgeGrid.cpp b/src/libslic3r/EdgeGrid.cpp
index 9d02ef09b7..f40d499de1 100644
--- a/src/libslic3r/EdgeGrid.cpp
+++ b/src/libslic3r/EdgeGrid.cpp
@@ -11,6 +11,7 @@
 #include "libslic3r.h"
 #include "ClipperUtils.hpp"
 #include "EdgeGrid.hpp"
+#include "Geometry.hpp"
 #include "SVG.hpp"
 
 #if 0
@@ -275,134 +276,24 @@ void EdgeGrid::Grid::create_from_m_contours(coord_t resolution)
 	// 6) Finally fill in m_cell_data by rasterizing the lines once again.
 	for (size_t i = 0; i < m_cells.size(); ++i)
 		m_cells[i].end = m_cells[i].begin;
-	for (size_t i = 0; i < m_contours.size(); ++i) {
-		const Slic3r::Points &pts = *m_contours[i];
-		for (size_t j = 0; j < pts.size(); ++j) {
-			// End points of the line segment.
-			Slic3r::Point p1(pts[j]);
-			Slic3r::Point p2 = pts[(j + 1 == pts.size()) ? 0 : j + 1];
-			p1(0) -= m_bbox.min(0);
-			p1(1) -= m_bbox.min(1);
-			p2(0) -= m_bbox.min(0);
-			p2(1) -= m_bbox.min(1);
-			// Get the cells of the end points.
-			coord_t ix = p1(0) / m_resolution;
-			coord_t iy = p1(1) / m_resolution;
-			coord_t ixb = p2(0) / m_resolution;
-			coord_t iyb = p2(1) / m_resolution;
-			assert(ix >= 0 && size_t(ix) < m_cols);
-			assert(iy >= 0 && size_t(iy) < m_rows);
-			assert(ixb >= 0 && size_t(ixb) < m_cols);
-			assert(iyb >= 0 && size_t(iyb) < m_rows);
-			// Account for the end points.
-			m_cell_data[m_cells[iy*m_cols + ix].end++] = std::pair<size_t, size_t>(i, j);
-			if (ix == ixb && iy == iyb)
-				// Both ends fall into the same cell.
-				continue;
-			// Raster the centeral part of the line.
-			coord_t dx = std::abs(p2(0) - p1(0));
-			coord_t dy = std::abs(p2(1) - p1(1));
-			if (p1(0) < p2(0)) {
-				int64_t ex = int64_t((ix + 1)*m_resolution - p1(0)) * int64_t(dy);
-				if (p1(1) < p2(1)) {
-					// x positive, y positive
-					int64_t ey = int64_t((iy + 1)*m_resolution - p1(1)) * int64_t(dx);
-					do {
-						assert(ix <= ixb && iy <= iyb);
-						if (ex < ey) {
-							ey -= ex;
-							ex = int64_t(dy) * m_resolution;
-							ix += 1;
-						}
-						else if (ex == ey) {
-							ex = int64_t(dy) * m_resolution;
-							ey = int64_t(dx) * m_resolution;
-							ix += 1;
-							iy += 1;
-						}
-						else {
-							assert(ex > ey);
-							ex -= ey;
-							ey = int64_t(dx) * m_resolution;
-							iy += 1;
-						}
-						m_cell_data[m_cells[iy*m_cols + ix].end++] = std::pair<size_t, size_t>(i, j);
-					} while (ix != ixb || iy != iyb);
-				}
-				else {
-					// x positive, y non positive
-					int64_t ey = int64_t(p1(1) - iy*m_resolution) * int64_t(dx);
-					do {
-						assert(ix <= ixb && iy >= iyb);
-						if (ex <= ey) {
-							ey -= ex;
-							ex = int64_t(dy) * m_resolution;
-							ix += 1;
-						}
-						else {
-							ex -= ey;
-							ey = int64_t(dx) * m_resolution;
-							iy -= 1;
-						}
-						m_cell_data[m_cells[iy*m_cols + ix].end++] = std::pair<size_t, size_t>(i, j);
-					} while (ix != ixb || iy != iyb);
-				}
-			}
-			else {
-				int64_t ex = int64_t(p1(0) - ix*m_resolution) * int64_t(dy);
-				if (p1(1) < p2(1)) {
-					// x non positive, y positive
-					int64_t ey = int64_t((iy + 1)*m_resolution - p1(1)) * int64_t(dx);
-					do {
-						assert(ix >= ixb && iy <= iyb);
-						if (ex < ey) {
-							ey -= ex;
-							ex = int64_t(dy) * m_resolution;
-							ix -= 1;
-						}
-						else {
-							assert(ex >= ey);
-							ex -= ey;
-							ey = int64_t(dx) * m_resolution;
-							iy += 1;
-						}
-						m_cell_data[m_cells[iy*m_cols + ix].end++] = std::pair<size_t, size_t>(i, j);
-					} while (ix != ixb || iy != iyb);
-				}
-				else {
-					// x non positive, y non positive
-					int64_t ey = int64_t(p1(1) - iy*m_resolution) * int64_t(dx);
-					do {
-						assert(ix >= ixb && iy >= iyb);
-						if (ex < ey) {
-							ey -= ex;
-							ex = int64_t(dy) * m_resolution;
-							ix -= 1;
-						}
-						else if (ex == ey) {
-							// The lower edge of a grid cell belongs to the cell.
-							// Handle the case where the ray may cross the lower left corner of a cell in a general case,
-							// or a left or lower edge in a degenerate case (horizontal or vertical line).
-							if (dx > 0) {
-								ex = int64_t(dy) * m_resolution;
-								ix -= 1;
-							}
-							if (dy > 0) {
-								ey = int64_t(dx) * m_resolution;
-								iy -= 1;
-							}
-						}
-						else {
-							assert(ex > ey);
-							ex -= ey;
-							ey = int64_t(dx) * m_resolution;
-							iy -= 1;
-						}
-						m_cell_data[m_cells[iy*m_cols + ix].end++] = std::pair<size_t, size_t>(i, j);
-					} while (ix != ixb || iy != iyb);
-				}
-			}
-		}
+
+	struct Visitor {
+		Visitor(std::vector<std::pair<size_t, size_t>> &cell_data, std::vector<Cell> &cells, size_t cols) :
+			cell_data(cell_data), cells(cells), cols(cols), i(0), j(0) {}
+
+		void operator()(coord_t iy, coord_t ix) { cell_data[cells[iy*cols + ix].end++] = std::pair<size_t, size_t>(i, j); }
+
+		std::vector<std::pair<size_t, size_t>> &cell_data;
+		std::vector<Cell> 					   &cells;
+		size_t									cols;
+		size_t 									i;
+		size_t 									j;
+	} visitor(m_cell_data, m_cells, m_cols);
+
+	for (; visitor.i < m_contours.size(); ++ visitor.i) {
+		const Slic3r::Points &pts = *m_contours[visitor.i];
+		for (; visitor.j < pts.size(); ++ visitor.j)
+			this->visit_cells_intersecting_line(pts[visitor.j], pts[(visitor.j + 1 == pts.size()) ? 0 : visitor.j + 1], visitor);
 	}
 }
 
@@ -1360,28 +1251,6 @@ Polygons EdgeGrid::Grid::contours_simplified(coord_t offset, bool fill_holes) co
 	return out;
 }
 
-inline int segments_could_intersect(
-	const Slic3r::Point &ip1, const Slic3r::Point &ip2, 
-	const Slic3r::Point &jp1, const Slic3r::Point &jp2)
-{
-	Vec2i64 iv   = (ip2 - ip1).cast<int64_t>();
-	Vec2i64 vij1 = (jp1 - ip1).cast<int64_t>();
-	Vec2i64 vij2 = (jp2 - ip1).cast<int64_t>();
-	int64_t tij1 = cross2(iv, vij1);
-	int64_t tij2 = cross2(iv, vij2);
-	int     sij1 = (tij1 > 0) ? 1 : ((tij1 < 0) ? -1 : 0); // signum
-	int     sij2 = (tij2 > 0) ? 1 : ((tij2 < 0) ? -1 : 0);
-	return sij1 * sij2;
-}
-
-inline bool segments_intersect(
-	const Slic3r::Point &ip1, const Slic3r::Point &ip2, 
-	const Slic3r::Point &jp1, const Slic3r::Point &jp2)
-{
-	return segments_could_intersect(ip1, ip2, jp1, jp2) <= 0 && 
-		   segments_could_intersect(jp1, jp2, ip1, ip2) <= 0;
-}
-
 std::vector<std::pair<EdgeGrid::Grid::ContourEdge, EdgeGrid::Grid::ContourEdge>> EdgeGrid::Grid::intersecting_edges() const
 {
 	std::vector<std::pair<ContourEdge, ContourEdge>> out;
@@ -1405,7 +1274,7 @@ std::vector<std::pair<EdgeGrid::Grid::ContourEdge, EdgeGrid::Grid::ContourEdge>>
 					if (&ipts == &jpts && (&ip1 == &jp2 || &jp1 == &ip2))
 						// Segments of the same contour share a common vertex.
 						continue;
-					if (segments_intersect(ip1, ip2, jp1, jp2)) {
+					if (Geometry::segments_intersect(ip1, ip2, jp1, jp2)) {
 						// The two segments intersect. Add them to the output.
 						int jfirst = (&jpts < &ipts) || (&jpts == &ipts && jpt < ipt);
 						out.emplace_back(jfirst ? 
@@ -1440,7 +1309,7 @@ bool EdgeGrid::Grid::has_intersecting_edges() const
 					const Slic3r::Point  &jp1  = jpts[jpt];
 					const Slic3r::Point  &jp2  = jpts[(jpt + 1 == jpts.size()) ? 0 : jpt + 1];
 					if (! (&ipts == &jpts && (&ip1 == &jp2 || &jp1 == &ip2)) && 
-						segments_intersect(ip1, ip2, jp1, jp2))
+						Geometry::segments_intersect(ip1, ip2, jp1, jp2))
 						return true;
 				}
 			}
diff --git a/src/libslic3r/EdgeGrid.hpp b/src/libslic3r/EdgeGrid.hpp
index 7faafdb3e1..cad20e07bb 100644
--- a/src/libslic3r/EdgeGrid.hpp
+++ b/src/libslic3r/EdgeGrid.hpp
@@ -65,6 +65,145 @@ public:
 	std::vector<std::pair<ContourEdge, ContourEdge>> intersecting_edges() const;
 	bool 											 has_intersecting_edges() const;
 
+	template<typename FUNCTION> void visit_cells_intersecting_line(Slic3r::Point p1, Slic3r::Point p2, FUNCTION func) const
+	{
+		// End points of the line segment.
+		p1(0) -= m_bbox.min(0);
+		p1(1) -= m_bbox.min(1);
+		p2(0) -= m_bbox.min(0);
+		p2(1) -= m_bbox.min(1);
+		// Get the cells of the end points.
+		coord_t ix = p1(0) / m_resolution;
+		coord_t iy = p1(1) / m_resolution;
+		coord_t ixb = p2(0) / m_resolution;
+		coord_t iyb = p2(1) / m_resolution;
+		assert(ix >= 0 && size_t(ix) < m_cols);
+		assert(iy >= 0 && size_t(iy) < m_rows);
+		assert(ixb >= 0 && size_t(ixb) < m_cols);
+		assert(iyb >= 0 && size_t(iyb) < m_rows);
+		// Account for the end points.
+		func(iy, ix);
+		if (ix == ixb && iy == iyb)
+			// Both ends fall into the same cell.
+			return;
+		// Raster the centeral part of the line.
+		coord_t dx = std::abs(p2(0) - p1(0));
+		coord_t dy = std::abs(p2(1) - p1(1));
+		if (p1(0) < p2(0)) {
+			int64_t ex = int64_t((ix + 1)*m_resolution - p1(0)) * int64_t(dy);
+			if (p1(1) < p2(1)) {
+				// x positive, y positive
+				int64_t ey = int64_t((iy + 1)*m_resolution - p1(1)) * int64_t(dx);
+				do {
+					assert(ix <= ixb && iy <= iyb);
+					if (ex < ey) {
+						ey -= ex;
+						ex = int64_t(dy) * m_resolution;
+						ix += 1;
+					}
+					else if (ex == ey) {
+						ex = int64_t(dy) * m_resolution;
+						ey = int64_t(dx) * m_resolution;
+						ix += 1;
+						iy += 1;
+					}
+					else {
+						assert(ex > ey);
+						ex -= ey;
+						ey = int64_t(dx) * m_resolution;
+						iy += 1;
+					}
+					func(iy, ix);
+				} while (ix != ixb || iy != iyb);
+			}
+			else {
+				// x positive, y non positive
+				int64_t ey = int64_t(p1(1) - iy*m_resolution) * int64_t(dx);
+				do {
+					assert(ix <= ixb && iy >= iyb);
+					if (ex <= ey) {
+						ey -= ex;
+						ex = int64_t(dy) * m_resolution;
+						ix += 1;
+					}
+					else {
+						ex -= ey;
+						ey = int64_t(dx) * m_resolution;
+						iy -= 1;
+					}
+					func(iy, ix);
+				} while (ix != ixb || iy != iyb);
+			}
+		}
+		else {
+			int64_t ex = int64_t(p1(0) - ix*m_resolution) * int64_t(dy);
+			if (p1(1) < p2(1)) {
+				// x non positive, y positive
+				int64_t ey = int64_t((iy + 1)*m_resolution - p1(1)) * int64_t(dx);
+				do {
+					assert(ix >= ixb && iy <= iyb);
+					if (ex < ey) {
+						ey -= ex;
+						ex = int64_t(dy) * m_resolution;
+						ix -= 1;
+					}
+					else {
+						assert(ex >= ey);
+						ex -= ey;
+						ey = int64_t(dx) * m_resolution;
+						iy += 1;
+					}
+					func(iy, ix);
+				} while (ix != ixb || iy != iyb);
+			}
+			else {
+				// x non positive, y non positive
+				int64_t ey = int64_t(p1(1) - iy*m_resolution) * int64_t(dx);
+				do {
+					assert(ix >= ixb && iy >= iyb);
+					if (ex < ey) {
+						ey -= ex;
+						ex = int64_t(dy) * m_resolution;
+						ix -= 1;
+					}
+					else if (ex == ey) {
+						// The lower edge of a grid cell belongs to the cell.
+						// Handle the case where the ray may cross the lower left corner of a cell in a general case,
+						// or a left or lower edge in a degenerate case (horizontal or vertical line).
+						if (dx > 0) {
+							ex = int64_t(dy) * m_resolution;
+							ix -= 1;
+						}
+						if (dy > 0) {
+							ey = int64_t(dx) * m_resolution;
+							iy -= 1;
+						}
+					}
+					else {
+						assert(ex > ey);
+						ex -= ey;
+						ey = int64_t(dx) * m_resolution;
+						iy -= 1;
+					}
+					func(iy, ix);
+				} while (ix != ixb || iy != iyb);
+			}
+		}
+	}
+
+	std::pair<std::vector<std::pair<size_t, size_t>>::const_iterator, std::vector<std::pair<size_t, size_t>>::const_iterator> cell_data_range(coord_t row, coord_t col) const
+	{
+		const EdgeGrid::Grid::Cell &cell = m_cells[row * m_cols + col];
+		return std::make_pair(m_cell_data.begin() + cell.begin, m_cell_data.begin() + cell.end);
+	}
+
+	std::pair<const Slic3r::Point&, const Slic3r::Point&> segment(const std::pair<size_t, size_t> &contour_and_segment_idx) const
+	{
+		const Slic3r::Points &ipts = *m_contours[contour_and_segment_idx.first];
+		size_t ipt = contour_and_segment_idx.second;
+		return std::pair<const Slic3r::Point&, const Slic3r::Point&>(ipts[ipt], ipts[(ipt + 1 == ipts.size()) ? 0 : ipt + 1]);
+	}
+
 protected:
 	struct Cell {
 		Cell() : begin(0), end(0) {}
diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index b691203c97..cc7262cd81 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -197,9 +197,6 @@ std::string WipeTowerIntegration::append_tcr(GCode &gcodegen, const WipeTower::T
 
     std::string tcr_rotated_gcode = post_process_wipe_tower_moves(tcr, wipe_tower_offset, wipe_tower_rotation);
 
-    // Disable linear advance for the wipe tower operations.
-    gcode += (gcodegen.config().gcode_flavor == gcfRepRap ? std::string("M572 D0 S0\n") : std::string("M900 K0\n"));
-
     if (!tcr.priming) {
         // Move over the wipe tower.
         // Retract for a tool change, using the toolchange retract value and setting the priming extra length.
@@ -474,8 +471,10 @@ std::vector<GCode::LayerToPrint> GCode::collect_layers_to_print(const PrintObjec
 
             if (layer_to_print.print_z() > maximal_print_z + EPSILON)
                 throw std::runtime_error(_(L("Empty layers detected, the output would not be printable.")) + "\n\n" +
-                                         _(L("Object name: ")) + object.model_object()->name + "\n" + _(L("Print z: ")) +
-                                         std::to_string(layers_to_print.back().print_z()));
+                    _(L("Object name: ")) + object.model_object()->name + "\n" + _(L("Print z: ")) +
+                    std::to_string(layers_to_print.back().print_z()) + "\n\n" + _(L("This is "
+                    "usually caused by negligibly small extrusions or by a faulty model. Try to repair "
+                    " the model or change its orientation on the bed.")));
             // Remember last layer with extrusions.
             last_extrusion_layer = &layers_to_print.back();
         }
@@ -608,7 +607,7 @@ void GCode::do_export(Print *print, const char *path, GCodePreviewData *preview_
         m_analyzer.reset();
     }
 
-    if (rename_file(path_tmp, path) != 0)
+    if (rename_file(path_tmp, path))
         throw std::runtime_error(
             std::string("Failed to rename the output G-code file from ") + path_tmp + " to " + path + '\n' +
             "Is " + path_tmp + " locked?" + '\n');
@@ -2888,7 +2887,7 @@ std::string GCode::set_extruder(unsigned int extruder_id, double print_z)
 
     // Set the temperature if the wipe tower didn't (not needed for non-single extruder MM)
     if (m_config.single_extruder_multi_material && !m_config.wipe_tower) {
-        int temp = (m_layer_index == 0 ? m_config.first_layer_temperature.get_at(extruder_id) :
+        int temp = (m_layer_index <= 0 ? m_config.first_layer_temperature.get_at(extruder_id) :
                                          m_config.temperature.get_at(extruder_id));
 
         gcode += m_writer.set_temperature(temp, false);
diff --git a/src/libslic3r/GCode/ToolOrdering.cpp b/src/libslic3r/GCode/ToolOrdering.cpp
index 18437c8e16..9280aa33a4 100644
--- a/src/libslic3r/GCode/ToolOrdering.cpp
+++ b/src/libslic3r/GCode/ToolOrdering.cpp
@@ -101,23 +101,6 @@ ToolOrdering::ToolOrdering(const Print &print, unsigned int first_extruder, bool
     this->collect_extruder_statistics(prime_multi_material);
 }
 
-
-LayerTools& ToolOrdering::tools_for_layer(coordf_t print_z)
-{
-    auto it_layer_tools = std::lower_bound(m_layer_tools.begin(), m_layer_tools.end(), LayerTools(print_z - EPSILON));
-    assert(it_layer_tools != m_layer_tools.end());
-    coordf_t dist_min = std::abs(it_layer_tools->print_z - print_z);
-	for (++ it_layer_tools; it_layer_tools != m_layer_tools.end(); ++it_layer_tools) {
-        coordf_t d = std::abs(it_layer_tools->print_z - print_z);
-        if (d >= dist_min)
-            break;
-        dist_min = d;
-    }
-    -- it_layer_tools;
-    assert(dist_min < EPSILON);
-    return *it_layer_tools;
-}
-
 void ToolOrdering::initialize_layers(std::vector<coordf_t> &zs)
 {
     sort_remove_duplicates(zs);
@@ -156,7 +139,7 @@ void ToolOrdering::collect_extruders(const PrintObject &object)
         LayerTools &layer_tools = this->tools_for_layer(layer->print_z);
         // What extruders are required to print this object layer?
         for (size_t region_id = 0; region_id < object.region_volumes.size(); ++ region_id) {
-			const LayerRegion *layerm = (region_id < layer->regions().size()) ? layer->regions()[region_id] : nullptr;
+            const LayerRegion *layerm = (region_id < layer->regions().size()) ? layer->regions()[region_id] : nullptr;
             if (layerm == nullptr)
                 continue;
             const PrintRegion &region = *object.print()->regions()[region_id];
@@ -336,10 +319,10 @@ void ToolOrdering::fill_wipe_tower_partitions(const PrintConfig &config, coordf_
                         // If it is a bug, it's likely not critical, because this code is unchanged for a long time. It might
                         // still be worth looking into it more and decide if it is a bug or an obsolete assert.
                         //assert(lt_prev.extruders.back() == lt_next.extruders.front());
-						lt_extra.has_wipe_tower = true;
+                        lt_extra.has_wipe_tower = true;
                         lt_extra.extruders.push_back(lt_next.extruders.front());
-						lt_extra.wipe_tower_partitions = lt_next.wipe_tower_partitions;
-					}
+                        lt_extra.wipe_tower_partitions = lt_next.wipe_tower_partitions;
+                    }
                 }
             }
             break;
@@ -381,7 +364,7 @@ void ToolOrdering::collect_extruder_statistics(bool prime_multi_material)
         // Reorder m_all_printing_extruders in the sequence they will be primed, the last one will be m_first_printing_extruder.
         // Then set m_first_printing_extruder to the 1st extruder primed.
         m_all_printing_extruders.erase(
-            std::remove_if(m_all_printing_extruders.begin(), m_all_printing_extruders.end(), 
+            std::remove_if(m_all_printing_extruders.begin(), m_all_printing_extruders.end(),
                 [ this ](const unsigned int eid) { return eid == m_first_printing_extruder; }),
             m_all_printing_extruders.end());
         m_all_printing_extruders.emplace_back(m_first_printing_extruder);
@@ -629,6 +612,6 @@ const std::vector<int>* WipingExtrusions::get_extruder_overrides(const Extrusion
 
     return &(entity_map_it->second);
 }
-    
+
 
 } // namespace Slic3r
diff --git a/src/libslic3r/GCode/ToolOrdering.hpp b/src/libslic3r/GCode/ToolOrdering.hpp
index 538127810d..d4006120d2 100644
--- a/src/libslic3r/GCode/ToolOrdering.hpp
+++ b/src/libslic3r/GCode/ToolOrdering.hpp
@@ -102,45 +102,60 @@ private:
 class ToolOrdering
 {
 public:
-	ToolOrdering() {}
+    ToolOrdering() {}
 
-	// For the use case when each object is printed separately
-	// (print.config.complete_objects is true).
-	ToolOrdering(const PrintObject &object, unsigned int first_extruder = (unsigned int)-1, bool prime_multi_material = false);
+    // For the use case when each object is printed separately
+    // (print.config.complete_objects is true).
+    ToolOrdering(const PrintObject &object, unsigned int first_extruder = (unsigned int)-1, bool prime_multi_material = false);
 
-	// For the use case when all objects are printed at once.
-	// (print.config.complete_objects is false).
-	ToolOrdering(const Print &print, unsigned int first_extruder = (unsigned int)-1, bool prime_multi_material = false);
+    // For the use case when all objects are printed at once.
+    // (print.config.complete_objects is false).
+    ToolOrdering(const Print &print, unsigned int first_extruder = (unsigned int)-1, bool prime_multi_material = false);
 
-	void 				clear() { m_layer_tools.clear(); }
+    void 				clear() { m_layer_tools.clear(); }
 
-	// Get the first extruder printing, including the extruder priming areas, returns -1 if there is no layer printed.
-	unsigned int   		first_extruder() const { return m_first_printing_extruder; }
+    // Get the first extruder printing, including the extruder priming areas, returns -1 if there is no layer printed.
+    unsigned int   		first_extruder() const { return m_first_printing_extruder; }
 
-	// Get the first extruder printing the layer_tools, returns -1 if there is no layer printed.
-	unsigned int   		last_extruder() const { return m_last_printing_extruder; }
+    // Get the first extruder printing the layer_tools, returns -1 if there is no layer printed.
+    unsigned int   		last_extruder() const { return m_last_printing_extruder; }
 
-	// For a multi-material print, the printing extruders are ordered in the order they shall be primed.
-	const std::vector<unsigned int>& all_extruders() const { return m_all_printing_extruders; }
+    // For a multi-material print, the printing extruders are ordered in the order they shall be primed.
+    const std::vector<unsigned int>& all_extruders() const { return m_all_printing_extruders; }
 
-	// Find LayerTools with the closest print_z.
-	LayerTools&			tools_for_layer(coordf_t print_z);
-	const LayerTools&	tools_for_layer(coordf_t print_z) const 
-		{ return *const_cast<const LayerTools*>(&const_cast<const ToolOrdering*>(this)->tools_for_layer(print_z)); }
+    template<class Self> static auto tools_for_layer(Self& self, coordf_t print_z) -> decltype (*self.m_layer_tools.begin())
+    {
+        auto it_layer_tools = std::lower_bound(self.m_layer_tools.begin(), self.m_layer_tools.end(), LayerTools(print_z - EPSILON));
+        assert(it_layer_tools != self.m_layer_tools.end());
+        coordf_t dist_min = std::abs(it_layer_tools->print_z - print_z);
+        for (++ it_layer_tools; it_layer_tools != self.m_layer_tools.end(); ++it_layer_tools) {
+            coordf_t d = std::abs(it_layer_tools->print_z - print_z);
+            if (d >= dist_min)
+                break;
+            dist_min = d;
+        }
+        -- it_layer_tools;
+        assert(dist_min < EPSILON);
+        return *it_layer_tools;
+    }
 
-	const LayerTools&   front()       const { return m_layer_tools.front(); }
-	const LayerTools&   back()        const { return m_layer_tools.back(); }
-	std::vector<LayerTools>::const_iterator begin() const { return m_layer_tools.begin(); }
-	std::vector<LayerTools>::const_iterator end()   const { return m_layer_tools.end(); }
-	bool 				empty()       const { return m_layer_tools.empty(); }
-	std::vector<LayerTools>& layer_tools() { return m_layer_tools; }
-	bool 				has_wipe_tower() const { return ! m_layer_tools.empty() && m_first_printing_extruder != (unsigned int)-1 && m_layer_tools.front().wipe_tower_partitions > 0; }
+    // Find LayerTools with the closest print_z.
+    LayerTools&			tools_for_layer(coordf_t print_z) { return tools_for_layer(*this, print_z); }
+    const LayerTools&	tools_for_layer(coordf_t print_z) const { return tools_for_layer(*this, print_z); }
+
+    const LayerTools&   front()       const { return m_layer_tools.front(); }
+    const LayerTools&   back()        const { return m_layer_tools.back(); }
+    std::vector<LayerTools>::const_iterator begin() const { return m_layer_tools.begin(); }
+    std::vector<LayerTools>::const_iterator end()   const { return m_layer_tools.end(); }
+    bool 				empty()       const { return m_layer_tools.empty(); }
+    std::vector<LayerTools>& layer_tools() { return m_layer_tools; }
+    bool 				has_wipe_tower() const { return ! m_layer_tools.empty() && m_first_printing_extruder != (unsigned int)-1 && m_layer_tools.front().wipe_tower_partitions > 0; }
 
 private:
-	void				initialize_layers(std::vector<coordf_t> &zs);
-	void 				collect_extruders(const PrintObject &object);
-	void				reorder_extruders(unsigned int last_extruder_id);
-	void 				fill_wipe_tower_partitions(const PrintConfig &config, coordf_t object_bottom_z);
+    void				initialize_layers(std::vector<coordf_t> &zs);
+    void 				collect_extruders(const PrintObject &object);
+    void				reorder_extruders(unsigned int last_extruder_id);
+    void 				fill_wipe_tower_partitions(const PrintConfig &config, coordf_t object_bottom_z);
     void 				collect_extruder_statistics(bool prime_multi_material);
 
     std::vector<LayerTools>    m_layer_tools;
diff --git a/src/libslic3r/GCode/WipeTower.cpp b/src/libslic3r/GCode/WipeTower.cpp
index e1b34fdeae..6f09f034fd 100644
--- a/src/libslic3r/GCode/WipeTower.cpp
+++ b/src/libslic3r/GCode/WipeTower.cpp
@@ -22,6 +22,7 @@ TODO LIST
 #include <numeric>
 
 #include "Analyzer.hpp"
+#include "BoundingBox.hpp"
 
 #if defined(__linux) || defined(__GNUC__ )
 #include <strings.h>
@@ -113,6 +114,11 @@ public:
         return (*this);
     }
 
+    WipeTowerWriter&            disable_linear_advance() {
+        m_gcode += (m_gcode_flavor == gcfRepRap ? std::string("M572 D0 S0\n") : std::string("M900 K0\n"));
+        return *this;
+    }
+
 	// Suppress / resume G-code preview in Slic3r. Slic3r will have difficulty to differentiate the various
 	// filament loading and cooling moves from normal extrusion moves. Therefore the writer
 	// is asked to suppres output of some lines, which look like extrusions.
@@ -470,6 +476,83 @@ private:
 
 
 
+WipeTower::WipeTower(const PrintConfig& config, const std::vector<std::vector<float>>& wiping_matrix, size_t initial_tool) :
+    m_semm(config.single_extruder_multi_material.value),
+    m_wipe_tower_pos(config.wipe_tower_x, config.wipe_tower_y),
+    m_wipe_tower_width(config.wipe_tower_width),
+    m_wipe_tower_rotation_angle(config.wipe_tower_rotation_angle),
+    m_y_shift(0.f),
+    m_z_pos(0.f),
+    m_is_first_layer(false),
+    m_bridging(config.wipe_tower_bridging),
+    m_gcode_flavor(config.gcode_flavor),
+    m_current_tool(initial_tool),
+    wipe_volumes(wiping_matrix)
+{
+    // If this is a single extruder MM printer, we will use all the SE-specific config values.
+    // Otherwise, the defaults will be used to turn off the SE stuff.
+    if (m_semm) {
+        m_cooling_tube_retraction = config.cooling_tube_retraction;
+        m_cooling_tube_length = config.cooling_tube_length;
+        m_parking_pos_retraction = config.parking_pos_retraction;
+        m_extra_loading_move = config.extra_loading_move;
+        m_set_extruder_trimpot = config.high_current_on_filament_swap;
+    }
+    // Calculate where the priming lines should be - very naive test not detecting parallelograms or custom shapes
+    const std::vector<Vec2d>& bed_points = config.bed_shape.values;
+    m_bed_shape = (bed_points.size() == 4 ? RectangularBed : CircularBed);
+    m_bed_width = BoundingBoxf(bed_points).size().x();
+}
+
+
+
+void WipeTower::set_extruder(size_t idx, const PrintConfig& config)
+{
+    //while (m_filpar.size() < idx+1)   // makes sure the required element is in the vector
+    m_filpar.push_back(FilamentParameters());
+
+    m_filpar[idx].material = config.filament_type.get_at(idx);
+    m_filpar[idx].temperature = config.temperature.get_at(idx);
+    m_filpar[idx].first_layer_temperature = config.first_layer_temperature.get_at(idx);
+
+    // If this is a single extruder MM printer, we will use all the SE-specific config values.
+    // Otherwise, the defaults will be used to turn off the SE stuff.
+    if (m_semm) {
+        m_filpar[idx].loading_speed           = config.filament_loading_speed.get_at(idx);
+        m_filpar[idx].loading_speed_start     = config.filament_loading_speed_start.get_at(idx);
+        m_filpar[idx].unloading_speed         = config.filament_unloading_speed.get_at(idx);
+        m_filpar[idx].unloading_speed_start   = config.filament_unloading_speed_start.get_at(idx);
+        m_filpar[idx].delay                   = config.filament_toolchange_delay.get_at(idx);
+        m_filpar[idx].cooling_moves           = config.filament_cooling_moves.get_at(idx);
+        m_filpar[idx].cooling_initial_speed   = config.filament_cooling_initial_speed.get_at(idx);
+        m_filpar[idx].cooling_final_speed     = config.filament_cooling_final_speed.get_at(idx);
+    }
+
+    m_filpar[idx].filament_area = float((M_PI/4.f) * pow(config.filament_diameter.get_at(idx), 2)); // all extruders are assumed to have the same filament diameter at this point
+    float nozzle_diameter = config.nozzle_diameter.get_at(idx);
+    m_filpar[idx].nozzle_diameter = nozzle_diameter; // to be used in future with (non-single) multiextruder MM
+
+    float max_vol_speed = config.filament_max_volumetric_speed.get_at(idx);
+    if (max_vol_speed!= 0.f)
+        m_filpar[idx].max_e_speed = (max_vol_speed / filament_area());
+
+    m_perimeter_width = nozzle_diameter * Width_To_Nozzle_Ratio; // all extruders are now assumed to have the same diameter
+
+    if (m_semm) {
+        std::istringstream stream{config.filament_ramming_parameters.get_at(idx)};
+        float speed = 0.f;
+        stream >> m_filpar[idx].ramming_line_width_multiplicator >> m_filpar[idx].ramming_step_multiplicator;
+        m_filpar[idx].ramming_line_width_multiplicator /= 100;
+        m_filpar[idx].ramming_step_multiplicator /= 100;
+        while (stream >> speed)
+            m_filpar[idx].ramming_speed.push_back(speed);
+    }
+
+    m_used_filament_length.resize(std::max(m_used_filament_length.size(), idx + 1)); // makes sure that the vector is big enough so we don't have to check later
+}
+
+
+
 // Returns gcode to prime the nozzles at the front edge of the print bed.
 std::vector<WipeTower::ToolChangeResult> WipeTower::prime(
 	// print_z of the first layer.
@@ -488,9 +571,11 @@ std::vector<WipeTower::ToolChangeResult> WipeTower::prime(
     // therefore the homing position is shifted inside the bed by 0.2 in the firmware to [0.2, -2.0].
 //	box_coordinates cleaning_box(xy(0.5f, - 1.5f), m_wipe_tower_width, wipe_area);
 
-	const float prime_section_width = std::min(240.f / tools.size(), 60.f);
-	box_coordinates cleaning_box(Vec2f(5.f, 0.01f + m_perimeter_width/2.f), prime_section_width, 100.f);
-
+    float prime_section_width = std::min(0.9f * m_bed_width / tools.size(), 60.f);
+    box_coordinates cleaning_box(Vec2f(0.02f * m_bed_width, 0.01f + m_perimeter_width/2.f), prime_section_width, 100.f);
+    // In case of a circular bed, place it so it goes across the diameter and hope it will fit
+    if (m_bed_shape == CircularBed)
+        cleaning_box.translate(-m_bed_width/2 + m_bed_width * 0.03f, -m_bed_width * 0.12f);
 
     std::vector<ToolChangeResult> results;
 
@@ -818,6 +903,8 @@ void WipeTower::toolchange_Unload(
         }
     }
 
+    writer.disable_linear_advance();
+
     // now the ramming itself:
     while (i < m_filpar[m_current_tool].ramming_speed.size())
     {
diff --git a/src/libslic3r/GCode/WipeTower.hpp b/src/libslic3r/GCode/WipeTower.hpp
index 3c6b4afca2..fab75c5e60 100644
--- a/src/libslic3r/GCode/WipeTower.hpp
+++ b/src/libslic3r/GCode/WipeTower.hpp
@@ -78,83 +78,12 @@ public:
 	// y			-- y coordinates of wipe tower in mm ( left bottom corner )
 	// width		-- width of wipe tower in mm ( default 60 mm - leave as it is )
 	// wipe_area	-- space available for one toolchange in mm
-	WipeTower(bool semm, float x, float y, float width, float rotation_angle, float cooling_tube_retraction,
-              float cooling_tube_length, float parking_pos_retraction, float extra_loading_move, 
-              float bridging, bool set_extruder_trimpot, GCodeFlavor flavor,
-              const std::vector<std::vector<float>>& wiping_matrix, unsigned int initial_tool) :
-        m_semm(semm),
-        m_wipe_tower_pos(x, y),
-		m_wipe_tower_width(width),
-		m_wipe_tower_rotation_angle(rotation_angle),
-		m_y_shift(0.f),
-		m_z_pos(0.f),
-		m_is_first_layer(false),
-        m_gcode_flavor(flavor),
-        m_bridging(bridging),
-        m_current_tool(initial_tool),
-        wipe_volumes(wiping_matrix)
-        {
-            // If this is a single extruder MM printer, we will use all the SE-specific config values.
-            // Otherwise, the defaults will be used to turn off the SE stuff.
-            if (m_semm) {
-                m_cooling_tube_retraction = cooling_tube_retraction;
-                m_cooling_tube_length = cooling_tube_length;
-                m_parking_pos_retraction = parking_pos_retraction;
-                m_extra_loading_move = extra_loading_move;
-                m_set_extruder_trimpot = set_extruder_trimpot;
-            }
-        }
-
+    WipeTower(const PrintConfig& config, const std::vector<std::vector<float>>& wiping_matrix, size_t initial_tool);
 	virtual ~WipeTower() {}
 
 
 	// Set the extruder properties.
-	void set_extruder(size_t idx, std::string material, int temp, int first_layer_temp, float loading_speed, float loading_speed_start,
-                      float unloading_speed, float unloading_speed_start, float delay, int cooling_moves,
-                      float cooling_initial_speed, float cooling_final_speed, std::string ramming_parameters, float max_volumetric_speed,
-                      float nozzle_diameter, float filament_diameter)
-	{
-        //while (m_filpar.size() < idx+1)   // makes sure the required element is in the vector
-        m_filpar.push_back(FilamentParameters());
-
-        m_filpar[idx].material = material;
-        m_filpar[idx].temperature = temp;
-        m_filpar[idx].first_layer_temperature = first_layer_temp;
-
-        // If this is a single extruder MM printer, we will use all the SE-specific config values.
-        // Otherwise, the defaults will be used to turn off the SE stuff.
-        if (m_semm) {
-            m_filpar[idx].loading_speed           = loading_speed;
-            m_filpar[idx].loading_speed_start     = loading_speed_start;
-            m_filpar[idx].unloading_speed         = unloading_speed;
-            m_filpar[idx].unloading_speed_start   = unloading_speed_start;
-            m_filpar[idx].delay                   = delay;
-            m_filpar[idx].cooling_moves           = cooling_moves;
-            m_filpar[idx].cooling_initial_speed   = cooling_initial_speed;
-            m_filpar[idx].cooling_final_speed     = cooling_final_speed;
-        }
-
-        m_filpar[idx].filament_area = float((M_PI/4.f) * pow(filament_diameter, 2)); // all extruders are assumed to have the same filament diameter at this point
-        m_filpar[idx].nozzle_diameter = nozzle_diameter; // to be used in future with (non-single) multiextruder MM
-
-        if (max_volumetric_speed != 0.f)
-            m_filpar[idx].max_e_speed = (max_volumetric_speed / filament_area());
-
-        m_perimeter_width = nozzle_diameter * Width_To_Nozzle_Ratio; // all extruders are now assumed to have the same diameter
-
-        if (m_semm) {
-            std::stringstream stream{ramming_parameters};
-            float speed = 0.f;
-            stream >> m_filpar[idx].ramming_line_width_multiplicator >> m_filpar[idx].ramming_step_multiplicator;
-            m_filpar[idx].ramming_line_width_multiplicator /= 100;
-            m_filpar[idx].ramming_step_multiplicator /= 100;
-            while (stream >> speed)
-                m_filpar[idx].ramming_speed.push_back(speed);
-        }
-
-        m_used_filament_length.resize(std::max(m_used_filament_length.size(), idx + 1)); // makes sure that the vector is big enough so we don't have to check later
-	}
-
+    void set_extruder(size_t idx, const PrintConfig& config);
 
 	// Appends into internal structure m_plan containing info about the future wipe tower
 	// to be used before building begins. The entries must be added ordered in z.
@@ -263,7 +192,6 @@ private:
 		SHAPE_REVERSED = -1
 	};
 
-
     const bool  m_peters_wipe_tower   = false; // sparse wipe tower inspired by Peter's post processor - not finished yet
     const float Width_To_Nozzle_Ratio = 1.25f; // desired line width (oval) in multiples of nozzle diameter - may not be actually neccessary to adjust
     const float WT_EPSILON            = 1e-3f;
@@ -295,6 +223,13 @@ private:
     bool            m_adhesion                  = true;
     GCodeFlavor     m_gcode_flavor;
 
+    // Bed properties
+    enum {
+        RectangularBed,
+        CircularBed
+    } m_bed_shape;
+    float m_bed_width; // width of the bed bounding box
+
 	float m_perimeter_width = 0.4f * Width_To_Nozzle_Ratio; // Width of an extrusion line, also a perimeter spacing for 100% infill.
 	float m_extrusion_flow = 0.038f; //0.029f;// Extrusion flow is derived from m_perimeter_width, layer height and filament diameter.
 
diff --git a/src/libslic3r/GCodeTimeEstimator.cpp b/src/libslic3r/GCodeTimeEstimator.cpp
index 8a2e1266a8..a03d3c7c85 100644
--- a/src/libslic3r/GCodeTimeEstimator.cpp
+++ b/src/libslic3r/GCodeTimeEstimator.cpp
@@ -390,7 +390,7 @@ namespace Slic3r {
         fclose(out);
         in.close();
 
-        if (rename_file(path_tmp, filename) != 0)
+        if (rename_file(path_tmp, filename))
             throw std::runtime_error(std::string("Failed to rename the output G-code file from ") + path_tmp + " to " + filename + '\n' +
             "Is " + path_tmp + " locked?" + '\n');
 
diff --git a/src/libslic3r/Geometry.hpp b/src/libslic3r/Geometry.hpp
index dca1872d82..eec2673227 100644
--- a/src/libslic3r/Geometry.hpp
+++ b/src/libslic3r/Geometry.hpp
@@ -111,6 +111,29 @@ inline bool segment_segment_intersection(const Vec2d &p1, const Vec2d &v1, const
     return true;
 }
 
+
+inline int segments_could_intersect(
+	const Slic3r::Point &ip1, const Slic3r::Point &ip2, 
+	const Slic3r::Point &jp1, const Slic3r::Point &jp2)
+{
+	Vec2i64 iv   = (ip2 - ip1).cast<int64_t>();
+	Vec2i64 vij1 = (jp1 - ip1).cast<int64_t>();
+	Vec2i64 vij2 = (jp2 - ip1).cast<int64_t>();
+	int64_t tij1 = cross2(iv, vij1);
+	int64_t tij2 = cross2(iv, vij2);
+	int     sij1 = (tij1 > 0) ? 1 : ((tij1 < 0) ? -1 : 0); // signum
+	int     sij2 = (tij2 > 0) ? 1 : ((tij2 < 0) ? -1 : 0);
+	return sij1 * sij2;
+}
+
+inline bool segments_intersect(
+	const Slic3r::Point &ip1, const Slic3r::Point &ip2, 
+	const Slic3r::Point &jp1, const Slic3r::Point &jp2)
+{
+	return segments_could_intersect(ip1, ip2, jp1, jp2) <= 0 && 
+		   segments_could_intersect(jp1, jp2, ip1, ip2) <= 0;
+}
+
 Pointf3s convex_hull(Pointf3s points);
 Polygon convex_hull(Points points);
 Polygon convex_hull(const Polygons &polygons);
diff --git a/src/libslic3r/MinAreaBoundingBox.cpp b/src/libslic3r/MinAreaBoundingBox.cpp
index fafb54a585..15c04517d0 100644
--- a/src/libslic3r/MinAreaBoundingBox.cpp
+++ b/src/libslic3r/MinAreaBoundingBox.cpp
@@ -1,6 +1,11 @@
 #include "MinAreaBoundingBox.hpp"
 
 #include <libslic3r/ExPolygon.hpp>
+
+#if defined(_MSC_VER) && defined(__clang__)
+#define BOOST_NO_CXX17_HDR_STRING_VIEW
+#endif
+
 #include <boost/rational.hpp>
 
 #include <libslic3r/Int128.hpp>
diff --git a/src/libslic3r/PolygonTrimmer.cpp b/src/libslic3r/PolygonTrimmer.cpp
new file mode 100644
index 0000000000..3e3c9b4982
--- /dev/null
+++ b/src/libslic3r/PolygonTrimmer.cpp
@@ -0,0 +1,56 @@
+#include "PolygonTrimmer.hpp"
+#include "EdgeGrid.hpp"
+#include "Geometry.hpp"
+
+namespace Slic3r {
+
+TrimmedLoop trim_loop(const Polygon &loop, const EdgeGrid::Grid &grid)
+{
+	assert(! loop.empty());
+	assert(loop.size() >= 2);
+
+	TrimmedLoop out;
+
+	if (loop.size() >= 2) {
+		size_t cnt = loop.points.size();
+
+		struct Visitor {
+			Visitor(const EdgeGrid::Grid &grid, const Slic3r::Point *pt_prev, const Slic3r::Point *pt_this) : grid(grid), pt_prev(pt_prev), pt_this(pt_this) {}
+
+			void operator()(coord_t iy, coord_t ix) {
+				// Called with a row and colum of the grid cell, which is intersected by a line.
+				auto cell_data_range = grid.cell_data_range(iy, ix);
+				for (auto it_contour_and_segment = cell_data_range.first; it_contour_and_segment != cell_data_range.second; ++ it_contour_and_segment) {
+					// End points of the line segment and their vector.
+					auto segment = grid.segment(*it_contour_and_segment);
+					if (Geometry::segments_intersect(segment.first, segment.second, *pt_prev, *pt_this)) {
+						// The two segments intersect. Add them to the output.
+					}
+				}
+			}
+
+			const EdgeGrid::Grid &grid;
+			const Slic3r::Point  *pt_this;
+			const Slic3r::Point  *pt_prev;
+		} visitor(grid, &loop.points.back(), nullptr);
+
+		for (const Point &pt_this : loop.points) {
+			visitor.pt_this = &pt_this;
+			grid.visit_cells_intersecting_line(*visitor.pt_prev, pt_this, visitor);
+			visitor.pt_prev = &pt_this;
+		}
+	}
+
+	return out;
+}
+
+std::vector<TrimmedLoop> trim_loops(const Polygons &loops, const EdgeGrid::Grid &grid)
+{
+	std::vector<TrimmedLoop> out;
+	out.reserve(loops.size());
+	for (const Polygon &loop : loops)
+		out.emplace_back(trim_loop(loop, grid));
+	return out;
+}
+
+}
diff --git a/src/libslic3r/PolygonTrimmer.hpp b/src/libslic3r/PolygonTrimmer.hpp
new file mode 100644
index 0000000000..b2a780be91
--- /dev/null
+++ b/src/libslic3r/PolygonTrimmer.hpp
@@ -0,0 +1,31 @@
+#ifndef slic3r_PolygonTrimmer_hpp_
+#define slic3r_PolygonTrimmer_hpp_
+
+#include "libslic3r.h"
+#include <vector>
+#include <string>
+#include "Line.hpp"
+#include "MultiPoint.hpp"
+#include "Polyline.hpp"
+
+namespace Slic3r {
+
+namespace EdgeGrid {
+	class Grid;
+}
+
+struct TrimmedLoop
+{
+	std::vector<Point> 			points;
+	// Number of points per segment. Empty if the loop is 
+	std::vector<unsigned int> 	segments;
+
+	bool 	is_trimmed() const { return ! segments.empty(); }
+};
+
+TrimmedLoop trim_loop(const Polygon &loop, const EdgeGrid::Grid &grid);
+std::vector<TrimmedLoop> trim_loops(const Polygons &loops, const EdgeGrid::Grid &grid);
+
+} // namespace Slic3r
+
+#endif /* slic3r_PolygonTrimmer_hpp_ */
diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index e376f54c30..71529cff15 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -262,8 +262,14 @@ std::vector<unsigned int> Print::object_extruders() const
 {
     std::vector<unsigned int> extruders;
     extruders.reserve(m_regions.size() * 3);
-    for (const PrintRegion *region : m_regions)
-        region->collect_object_printing_extruders(extruders);
+    std::vector<unsigned char> region_used(m_regions.size(), false);
+    for (const PrintObject *object : m_objects)
+		for (const std::vector<std::pair<t_layer_height_range, int>> &volumes_per_region : object->region_volumes)
+        	if (! volumes_per_region.empty())
+        		region_used[&volumes_per_region - &object->region_volumes.front()] = true;
+    for (size_t idx_region = 0; idx_region < m_regions.size(); ++ idx_region)
+    	if (region_used[idx_region])
+        	m_regions[idx_region]->collect_object_printing_extruders(extruders);
     sort_remove_duplicates(extruders);
     return extruders;
 }
@@ -273,17 +279,24 @@ std::vector<unsigned int> Print::support_material_extruders() const
 {
     std::vector<unsigned int> extruders;
     bool support_uses_current_extruder = false;
+    auto num_extruders = (unsigned int)m_config.nozzle_diameter.size();
 
     for (PrintObject *object : m_objects) {
         if (object->has_support_material()) {
+        	assert(object->config().support_material_extruder >= 0);
             if (object->config().support_material_extruder == 0)
                 support_uses_current_extruder = true;
-            else
-                extruders.push_back(object->config().support_material_extruder - 1);
+            else {
+            	unsigned int i = (unsigned int)object->config().support_material_extruder - 1;
+                extruders.emplace_back((i >= num_extruders) ? 0 : i);
+            }
+        	assert(object->config().support_material_interface_extruder >= 0);
             if (object->config().support_material_interface_extruder == 0)
                 support_uses_current_extruder = true;
-            else
-                extruders.push_back(object->config().support_material_interface_extruder - 1);
+            else {
+            	unsigned int i = (unsigned int)object->config().support_material_interface_extruder - 1;
+                extruders.emplace_back((i >= num_extruders) ? 0 : i);
+            }
         }
     }
 
@@ -577,6 +590,8 @@ Print::ApplyStatus Print::apply(const Model &model, DynamicPrintConfig new_full_
 
     // Apply variables to placeholder parser. The placeholder parser is used by G-code export,
     // which should be stopped if print_diff is not empty.
+    size_t num_extruders = m_config.nozzle_diameter.size();
+    bool   num_extruders_changed = false;
     if (! full_config_diff.empty() || ! placeholder_parser_overrides.empty()) {
         update_apply_status(this->invalidate_step(psGCodeExport));
 		m_placeholder_parser.apply_config(std::move(placeholder_parser_overrides));
@@ -592,6 +607,10 @@ Print::ApplyStatus Print::apply(const Model &model, DynamicPrintConfig new_full_
 	    // Handle changes to regions config defaults
 	    m_default_region_config.apply_only(new_full_config, region_diff, true);
         m_full_print_config = std::move(new_full_config);
+        if (num_extruders != m_config.nozzle_diameter.size()) {
+        	num_extruders = m_config.nozzle_diameter.size();
+        	num_extruders_changed = true;
+        }
     }
     
     class LayerRanges
@@ -768,7 +787,6 @@ Print::ApplyStatus Print::apply(const Model &model, DynamicPrintConfig new_full_
         print_object_status.emplace(PrintObjectStatus(print_object));
 
     // 3) Synchronize ModelObjects & PrintObjects.
-    size_t num_extruders = m_config.nozzle_diameter.size();
     for (size_t idx_model_object = 0; idx_model_object < model.objects.size(); ++ idx_model_object) {
         ModelObject &model_object = *m_model.objects[idx_model_object];
         auto it_status = model_object_status.find(ModelObjectStatus(model_object.id()));
@@ -815,7 +833,7 @@ Print::ApplyStatus Print::apply(const Model &model, DynamicPrintConfig new_full_
             bool object_config_changed = model_object.config != model_object_new.config;
 			if (object_config_changed)
 				static_cast<DynamicPrintConfig&>(model_object.config) = static_cast<const DynamicPrintConfig&>(model_object_new.config);
-            if (! object_diff.empty() || object_config_changed) {
+            if (! object_diff.empty() || object_config_changed || num_extruders_changed) {
                 PrintObjectConfig new_config = PrintObject::object_config_from_model_object(m_default_object_config, model_object, num_extruders);
                 auto range = print_object_status.equal_range(PrintObjectStatus(model_object.id()));
                 for (auto it = range.first; it != range.second; ++ it) {
@@ -1144,7 +1162,12 @@ std::string Print::validate() const
         // #4043
         if (total_copies_count > 1 && ! m_config.complete_objects.value)
             return L("The Spiral Vase option can only be used when printing a single object.");
-        if (m_regions.size() > 1)
+        assert(m_objects.size() == 1);
+        size_t num_regions = 0;
+        for (const std::vector<std::pair<t_layer_height_range, int>> &volumes_per_region : m_objects.front()->region_volumes)
+        	if (! volumes_per_region.empty())
+        		++ num_regions;
+        if (num_regions > 1)
             return L("The Spiral Vase option can only be used when printing single material objects.");
     }
 
@@ -1258,7 +1281,7 @@ std::string Print::validate() const
         	} else if (extrusion_width_min <= layer_height) {
         		err_msg = (boost::format(L("%1%=%2% mm is too low to be printable at a layer height %3% mm")) % opt_key % extrusion_width_min % layer_height).str();
 				return false;
-			} else if (extrusion_width_max >= max_nozzle_diameter * 2.) {
+			} else if (extrusion_width_max >= max_nozzle_diameter * 3.) {
 				err_msg = (boost::format(L("Excessive %1%=%2% mm to be printable with a nozzle diameter %3% mm")) % opt_key % extrusion_width_max % max_nozzle_diameter).str();
 				return false;
 			}
@@ -1762,15 +1785,7 @@ void Print::_make_wipe_tower()
     this->throw_if_canceled();
 
     // Initialize the wipe tower.
-    WipeTower wipe_tower(
-        m_config.single_extruder_multi_material.value,
-        float(m_config.wipe_tower_x.value),     float(m_config.wipe_tower_y.value), 
-        float(m_config.wipe_tower_width.value),
-        float(m_config.wipe_tower_rotation_angle.value), float(m_config.cooling_tube_retraction.value),
-        float(m_config.cooling_tube_length.value), float(m_config.parking_pos_retraction.value),
-        float(m_config.extra_loading_move.value), float(m_config.wipe_tower_bridging),
-        m_config.high_current_on_filament_swap.value, m_config.gcode_flavor, wipe_volumes,
-        m_wipe_tower_data.tool_ordering.first_extruder());
+    WipeTower wipe_tower(m_config, wipe_volumes, m_wipe_tower_data.tool_ordering.first_extruder());
 
     //wipe_tower.set_retract();
     //wipe_tower.set_zhop();
@@ -1779,22 +1794,7 @@ void Print::_make_wipe_tower()
     for (size_t i = 0; i < number_of_extruders; ++ i)
 
         wipe_tower.set_extruder(
-            i, 
-            m_config.filament_type.get_at(i),
-            m_config.temperature.get_at(i),
-            m_config.first_layer_temperature.get_at(i),
-			(float)m_config.filament_loading_speed.get_at(i),
-			(float)m_config.filament_loading_speed_start.get_at(i),
-			(float)m_config.filament_unloading_speed.get_at(i),
-			(float)m_config.filament_unloading_speed_start.get_at(i),
-			(float)m_config.filament_toolchange_delay.get_at(i),
-            m_config.filament_cooling_moves.get_at(i),
-			(float)m_config.filament_cooling_initial_speed.get_at(i),
-			(float)m_config.filament_cooling_final_speed.get_at(i),
-            m_config.filament_ramming_parameters.get_at(i),
-            (float)m_config.filament_max_volumetric_speed.get_at(i),
-            (float)m_config.nozzle_diameter.get_at(i),
-            (float)m_config.filament_diameter.get_at(i));
+            i, m_config);
 
     m_wipe_tower_data.priming = Slic3r::make_unique<std::vector<WipeTower::ToolChangeResult>>(
         wipe_tower.prime((float)this->skirt_first_layer_height(), m_wipe_tower_data.tool_ordering.all_extruders(), false));
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 2033658640..8f56c1b83d 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -2412,6 +2412,22 @@ void PrintConfigDef::init_sla_params()
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionInt(10));
 
+    def = this->add("min_exposure_time", coFloat);
+    def->label = L("Minimum exposure time");
+    def->tooltip = L("Minimum exposure time");
+    def->sidetext = L("s");
+    def->min = 0;
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionFloat(0));
+
+    def = this->add("max_exposure_time", coFloat);
+    def->label = L("Maximum exposure time");
+    def->tooltip = L("Maximum exposure time");
+    def->sidetext = L("s");
+    def->min = 0;
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionFloat(100));
+
     def = this->add("exposure_time", coFloat);
     def->label = L("Exposure time");
     def->tooltip = L("Exposure time");
@@ -2419,6 +2435,22 @@ void PrintConfigDef::init_sla_params()
     def->min = 0;
     def->set_default_value(new ConfigOptionFloat(10));
 
+    def = this->add("min_initial_exposure_time", coFloat);
+    def->label = L("Minimum initial exposure time");
+    def->tooltip = L("Minimum initial exposure time");
+    def->sidetext = L("s");
+    def->min = 0;
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionFloat(0));
+
+    def = this->add("max_initial_exposure_time", coFloat);
+    def->label = L("Maximum initial exposure time");
+    def->tooltip = L("Maximum initial exposure time");
+    def->sidetext = L("s");
+    def->min = 0;
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionFloat(150));
+
     def = this->add("initial_exposure_time", coFloat);
     def->label = L("Initial exposure time");
     def->tooltip = L("Initial exposure time");
@@ -3290,7 +3322,7 @@ CLIMiscConfigDef::CLIMiscConfigDef()
     def->tooltip = L("Messages with severity lower or eqal to the loglevel will be printed out. 0:trace, 1:debug, 2:info, 3:warning, 4:error, 5:fatal");
     def->min = 0;
 
-#if defined(_MSC_VER) && defined(SLIC3R_GUI)
+#if (defined(_MSC_VER) || defined(__MINGW32__)) && defined(SLIC3R_GUI)
     def = this->add("sw_renderer", coBool);
     def->label = L("Render with a software renderer");
     def->tooltip = L("Render with a software renderer. The bundled MESA software renderer is loaded instead of the default OpenGL driver.");
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index 081f670e15..35025fcd10 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -1131,6 +1131,10 @@ public:
     ConfigOptionFloat                       fast_tilt_time;
     ConfigOptionFloat                       slow_tilt_time;
     ConfigOptionFloat                       area_fill;
+    ConfigOptionFloat                       min_exposure_time;
+    ConfigOptionFloat                       max_exposure_time;
+    ConfigOptionFloat                       min_initial_exposure_time;
+    ConfigOptionFloat                       max_initial_exposure_time;
 protected:
     void initialize(StaticCacheBase &cache, const char *base_ptr)
     {
@@ -1150,6 +1154,10 @@ protected:
         OPT_PTR(fast_tilt_time);
         OPT_PTR(slow_tilt_time);
         OPT_PTR(area_fill);
+        OPT_PTR(min_exposure_time);
+        OPT_PTR(max_exposure_time);
+        OPT_PTR(min_initial_exposure_time);
+        OPT_PTR(max_initial_exposure_time);
     }
 };
 
diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index 37cf0cccc7..e19bceeb76 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -161,7 +161,7 @@ void PrintObject::make_perimeters()
         const PrintRegion &region = *m_print->regions()[region_id];
         if (! region.config().extra_perimeters || region.config().perimeters == 0 || region.config().fill_density == 0 || this->layer_count() < 2)
             continue;
-        
+
         BOOST_LOG_TRIVIAL(debug) << "Generating extra perimeters for region " << region_id << " in parallel - start";
         tbb::parallel_for(
             tbb::blocked_range<size_t>(0, m_layers.size() - 1),
@@ -2379,7 +2379,7 @@ void PrintObject::discover_horizontal_shells()
                     if (new_internal_solid.empty()) {
                         // No internal solid needed on this layer. In order to decide whether to continue
                         // searching on the next neighbor (thus enforcing the configured number of solid
-                        // layers, use different strategies according to configured infill density:
+                        // layers, use different strategies according to configured infill density:
                         if (region_config.fill_density.value == 0) {
                             // If user expects the object to be void (for example a hollow sloping vase),
                             // don't continue the search. In this case, we only generate the external solid
diff --git a/src/libslic3r/PrintRegion.cpp b/src/libslic3r/PrintRegion.cpp
index 73b40487bc..fc2bdfa7d1 100644
--- a/src/libslic3r/PrintRegion.cpp
+++ b/src/libslic3r/PrintRegion.cpp
@@ -46,7 +46,7 @@ Flow PrintRegion::flow(FlowRole role, double layer_height, bool bridge, bool fir
     }
     double nozzle_diameter = m_print->config().nozzle_diameter.get_at(extruder-1);
     
-    return Flow::new_from_config_width(role, config_width, nozzle_diameter, layer_height, bridge ? (float)m_config.bridge_flow_ratio : 0.0);
+    return Flow::new_from_config_width(role, config_width, (float)nozzle_diameter, (float)layer_height, bridge ? (float)m_config.bridge_flow_ratio : 0.0f);
 }
 
 coordf_t PrintRegion::nozzle_dmr_avg(const PrintConfig &print_config) const
@@ -64,16 +64,27 @@ coordf_t PrintRegion::bridging_height_avg(const PrintConfig &print_config) const
 void PrintRegion::collect_object_printing_extruders(const PrintConfig &print_config, const PrintRegionConfig &region_config, std::vector<unsigned int> &object_extruders)
 {
     // These checks reflect the same logic used in the GUI for enabling/disabling extruder selection fields.
+    auto num_extruders = (int)print_config.nozzle_diameter.size();
+    auto emplace_extruder = [num_extruders, &object_extruders](int extruder_id) {
+    	int i = std::max(0, extruder_id - 1);
+        object_extruders.emplace_back((i >= num_extruders) ? 0 : i);
+    };
     if (region_config.perimeters.value > 0 || print_config.brim_width.value > 0)
-        object_extruders.emplace_back(region_config.perimeter_extruder - 1);
+    	emplace_extruder(region_config.perimeter_extruder);
     if (region_config.fill_density.value > 0)
-        object_extruders.emplace_back(region_config.infill_extruder - 1);
+    	emplace_extruder(region_config.infill_extruder);
     if (region_config.top_solid_layers.value > 0 || region_config.bottom_solid_layers.value > 0)
-        object_extruders.emplace_back(region_config.solid_infill_extruder - 1);
+    	emplace_extruder(region_config.solid_infill_extruder);
 }
 
 void PrintRegion::collect_object_printing_extruders(std::vector<unsigned int> &object_extruders) const
 {
+    auto num_extruders = (int)print()->config().nozzle_diameter.size();
+    // PrintRegion, if used by some PrintObject, shall have all the extruders set to an existing printer extruder.
+    // If not, then there must be something wrong with the Print::apply() function.
+    assert(this->config().perimeter_extruder    <= num_extruders);
+    assert(this->config().infill_extruder       <= num_extruders);
+    assert(this->config().solid_infill_extruder <= num_extruders);
     collect_object_printing_extruders(print()->config(), this->config(), object_extruders);
 }
 
diff --git a/src/libslic3r/SLA/SLAAutoSupports.cpp b/src/libslic3r/SLA/SLAAutoSupports.cpp
index 78efd08067..36378df395 100644
--- a/src/libslic3r/SLA/SLAAutoSupports.cpp
+++ b/src/libslic3r/SLA/SLAAutoSupports.cpp
@@ -1,5 +1,5 @@
-#include "igl/random_points_on_mesh.h"
-#include "igl/AABB.h"
+//#include "igl/random_points_on_mesh.h"
+//#include "igl/AABB.h"
 
 #include <tbb/parallel_for.h>
 
@@ -101,7 +101,7 @@ static std::vector<SLAAutoSupports::MyLayer> make_layers(
     std::vector<SLAAutoSupports::MyLayer> layers;
     layers.reserve(slices.size());
     for (size_t i = 0; i < slices.size(); ++ i)
-		layers.emplace_back(i, heights[i]);
+        layers.emplace_back(i, heights[i]);
 
     // FIXME: calculate actual pixel area from printer config:
     //const float pixel_area = pow(wxGetApp().preset_bundle->project_config.option<ConfigOptionFloat>("display_width") / wxGetApp().preset_bundle->project_config.option<ConfigOptionInt>("display_pixels_x"), 2.f); //
@@ -114,47 +114,47 @@ static std::vector<SLAAutoSupports::MyLayer> make_layers(
                 if ((layer_id % 8) == 0)
                     // Don't call the following function too often as it flushes CPU write caches due to synchronization primitves.
                     throw_on_cancel();
-				SLAAutoSupports::MyLayer &layer   = layers[layer_id];
+                SLAAutoSupports::MyLayer &layer   = layers[layer_id];
                 const ExPolygons		 &islands = slices[layer_id];
                 //FIXME WTF?
                 const float height = (layer_id>2 ? heights[layer_id-3] : heights[0]-(heights[1]-heights[0]));
-				layer.islands.reserve(islands.size());
+                layer.islands.reserve(islands.size());
                 for (const ExPolygon &island : islands) {
                     float area = float(island.area() * SCALING_FACTOR * SCALING_FACTOR);
                     if (area >= pixel_area)
                         //FIXME this is not a correct centroid of a polygon with holes.
-						layer.islands.emplace_back(layer, island, get_extents(island.contour), Slic3r::unscale(island.contour.centroid()).cast<float>(), area, height);
+                        layer.islands.emplace_back(layer, island, get_extents(island.contour), Slic3r::unscale(island.contour.centroid()).cast<float>(), area, height);
                 }
             }
         });
 
-	// Calculate overlap of successive layers. Link overlapping islands.
-	tbb::parallel_for(tbb::blocked_range<size_t>(1, layers.size(), 8),
-		[&layers, &heights, throw_on_cancel](const tbb::blocked_range<size_t>& range) {
-		for (size_t layer_id = range.begin(); layer_id < range.end(); ++layer_id) {
-			if ((layer_id % 2) == 0)
-				// Don't call the following function too often as it flushes CPU write caches due to synchronization primitves.
-				throw_on_cancel();
-			SLAAutoSupports::MyLayer &layer_above = layers[layer_id];
-			SLAAutoSupports::MyLayer &layer_below = layers[layer_id - 1];
+    // Calculate overlap of successive layers. Link overlapping islands.
+    tbb::parallel_for(tbb::blocked_range<size_t>(1, layers.size(), 8),
+        [&layers, &heights, throw_on_cancel](const tbb::blocked_range<size_t>& range) {
+        for (size_t layer_id = range.begin(); layer_id < range.end(); ++layer_id) {
+            if ((layer_id % 2) == 0)
+                // Don't call the following function too often as it flushes CPU write caches due to synchronization primitves.
+                throw_on_cancel();
+            SLAAutoSupports::MyLayer &layer_above = layers[layer_id];
+            SLAAutoSupports::MyLayer &layer_below = layers[layer_id - 1];
             //FIXME WTF?
             const float layer_height = (layer_id!=0 ? heights[layer_id]-heights[layer_id-1] : heights[0]);
             const float safe_angle = 5.f * (float(M_PI)/180.f); // smaller number - less supports
             const float between_layers_offset =  float(scale_(layer_height / std::tan(safe_angle)));
             const float slope_angle = 75.f * (float(M_PI)/180.f); // smaller number - less supports
             const float slope_offset = float(scale_(layer_height / std::tan(slope_angle)));
-			//FIXME This has a quadratic time complexity, it will be excessively slow for many tiny islands.
-			for (SLAAutoSupports::Structure &top : layer_above.islands) {
-				for (SLAAutoSupports::Structure &bottom : layer_below.islands) {
+            //FIXME This has a quadratic time complexity, it will be excessively slow for many tiny islands.
+            for (SLAAutoSupports::Structure &top : layer_above.islands) {
+                for (SLAAutoSupports::Structure &bottom : layer_below.islands) {
                     float overlap_area = top.overlap_area(bottom);
                     if (overlap_area > 0) {
-						top.islands_below.emplace_back(&bottom, overlap_area);
+                        top.islands_below.emplace_back(&bottom, overlap_area);
                         bottom.islands_above.emplace_back(&top, overlap_area);
                     }
                 }
                 if (! top.islands_below.empty()) {
                     Polygons top_polygons    = to_polygons(*top.polygon);
-					Polygons bottom_polygons = top.polygons_below();
+                    Polygons bottom_polygons = top.polygons_below();
                     top.overhangs = diff_ex(top_polygons, bottom_polygons);
                     if (! top.overhangs.empty()) {
                         top.overhangs_area = 0.f;
@@ -164,21 +164,21 @@ static std::vector<SLAAutoSupports::MyLayer> make_layers(
                             expolys_with_areas.emplace_back(&ex, area);
                             top.overhangs_area += area;
                         }
-                        std::sort(expolys_with_areas.begin(), expolys_with_areas.end(), 
+                        std::sort(expolys_with_areas.begin(), expolys_with_areas.end(),
                             [](const std::pair<ExPolygon*, float> &p1, const std::pair<ExPolygon*, float> &p2)
                                 { return p1.second > p2.second; });
                         ExPolygons overhangs_sorted;
                         for (auto &p : expolys_with_areas)
                             overhangs_sorted.emplace_back(std::move(*p.first));
-						top.overhangs = std::move(overhangs_sorted);
+                        top.overhangs = std::move(overhangs_sorted);
                         top.overhangs_area *= float(SCALING_FACTOR * SCALING_FACTOR);
                         top.overhangs_slopes = diff_ex(top_polygons, offset(bottom_polygons, slope_offset));
                         top.dangling_areas = diff_ex(top_polygons, offset(bottom_polygons, between_layers_offset));
                     }
                 }
-			}
-		}
-	});
+            }
+        }
+    });
 
     return layers;
 }
@@ -207,14 +207,14 @@ void SLAAutoSupports::process(const std::vector<ExPolygons>& slices, const std::
                 support_force_bottom[i] = layer_bottom->islands[i].supports_force_total();
         }
         for (Structure &top : layer_top->islands)
-			for (Structure::Link &bottom_link : top.islands_below) {
+            for (Structure::Link &bottom_link : top.islands_below) {
                 Structure &bottom = *bottom_link.island;
                 //float centroids_dist = (bottom.centroid - top.centroid).norm();
                 // Penalization resulting from centroid offset:
 //                  bottom.supports_force *= std::min(1.f, 1.f - std::min(1.f, (1600.f * layer_height) * centroids_dist * centroids_dist / bottom.area));
                 float &support_force = support_force_bottom[&bottom - layer_bottom->islands.data()];
 //FIXME this condition does not reflect a bifurcation into a one large island and one tiny island well, it incorrectly resets the support force to zero.
-// One should rather work with the overlap area vs overhang area.                
+// One should rather work with the overlap area vs overhang area.
 //                support_force *= std::min(1.f, 1.f - std::min(1.f, 0.1f * centroids_dist * centroids_dist / bottom.area));
                 // Penalization resulting from increasing polygon area:
                 support_force *= std::min(1.f, 20.f * bottom.area / top.area);
@@ -224,10 +224,10 @@ void SLAAutoSupports::process(const std::vector<ExPolygons>& slices, const std::
             for (Structure &below : layer_bottom->islands) {
                 float below_support_force = support_force_bottom[&below - layer_bottom->islands.data()];
                 float above_overlap_area = 0.f;
-				for (Structure::Link &above_link : below.islands_above)
-					above_overlap_area += above_link.overlap_area;
-				for (Structure::Link &above_link : below.islands_above)
-					above_link.island->supports_force_inherited += below_support_force * above_link.overlap_area / above_overlap_area;
+                for (Structure::Link &above_link : below.islands_above)
+                    above_overlap_area += above_link.overlap_area;
+                for (Structure::Link &above_link : below.islands_above)
+                    above_link.island->supports_force_inherited += below_support_force * above_link.overlap_area / above_overlap_area;
             }
         }
         // Now iterate over all polygons and append new points if needed.
@@ -266,7 +266,7 @@ void SLAAutoSupports::process(const std::vector<ExPolygons>& slices, const std::
 }
 
 std::vector<Vec2f> sample_expolygon(const ExPolygon &expoly, float samples_per_mm2, std::mt19937 &rng)
-{    
+{
     // Triangulate the polygon with holes into triplets of 3D points.
     std::vector<Vec2f> triangles = Slic3r::triangulate_expolygon_2f(expoly);
 
@@ -347,7 +347,7 @@ static inline std::vector<Vec2f> poisson_disk_from_samples(const std::vector<Vec
         sample.cell_id = ((pt - corner_min) / radius).cast<int>();
         raw_samples_sorted.emplace_back(sample);
     }
-    std::sort(raw_samples_sorted.begin(), raw_samples_sorted.end(), [](const RawSample &lhs, const RawSample &rhs) 
+    std::sort(raw_samples_sorted.begin(), raw_samples_sorted.end(), [](const RawSample &lhs, const RawSample &rhs)
         { return lhs.cell_id.x() < rhs.cell_id.x() || (lhs.cell_id.x() == rhs.cell_id.x() && lhs.cell_id.y() < rhs.cell_id.y()); });
 
     struct PoissonDiskGridEntry {
@@ -464,10 +464,10 @@ void SLAAutoSupports::uniformly_cover(const ExPolygons& islands, Structure& stru
     //FIXME share the random generator. The random generator may be not so cheap to initialize, also we don't want the random generator to be restarted for each polygon.
     std::random_device  rd;
     std::mt19937        rng(rd());
-	std::vector<Vec2f>  raw_samples = sample_expolygon_with_boundary(islands, samples_per_mm2, 5.f / poisson_radius, rng);
+    std::vector<Vec2f>  raw_samples = sample_expolygon_with_boundary(islands, samples_per_mm2, 5.f / poisson_radius, rng);
     std::vector<Vec2f>  poisson_samples;
     for (size_t iter = 0; iter < 4; ++ iter) {
-        poisson_samples = poisson_disk_from_samples(raw_samples, poisson_radius, 
+        poisson_samples = poisson_disk_from_samples(raw_samples, poisson_radius,
             [&structure, &grid3d, min_spacing](const Vec2f &pos) {
                 return grid3d.collides_with(pos, &structure, min_spacing);
             });
@@ -481,21 +481,21 @@ void SLAAutoSupports::uniformly_cover(const ExPolygons& islands, Structure& stru
     }
 
 #ifdef SLA_AUTOSUPPORTS_DEBUG
-	{
-		static int irun = 0;
-		Slic3r::SVG svg(debug_out_path("SLA_supports-uniformly_cover-%d.svg", irun ++), get_extents(islands));
+    {
+        static int irun = 0;
+        Slic3r::SVG svg(debug_out_path("SLA_supports-uniformly_cover-%d.svg", irun ++), get_extents(islands));
         for (const ExPolygon &island : islands)
             svg.draw(island);
-		for (const Vec2f &pt : raw_samples)
-			svg.draw(Point(scale_(pt.x()), scale_(pt.y())), "red");
-		for (const Vec2f &pt : poisson_samples)
-			svg.draw(Point(scale_(pt.x()), scale_(pt.y())), "blue");
-	}
+        for (const Vec2f &pt : raw_samples)
+            svg.draw(Point(scale_(pt.x()), scale_(pt.y())), "red");
+        for (const Vec2f &pt : poisson_samples)
+            svg.draw(Point(scale_(pt.x()), scale_(pt.y())), "blue");
+    }
 #endif /* NDEBUG */
 
 //    assert(! poisson_samples.empty());
     if (poisson_samples_target < poisson_samples.size()) {
-		std::shuffle(poisson_samples.begin(), poisson_samples.end(), rng);
+        std::shuffle(poisson_samples.begin(), poisson_samples.end(), rng);
         poisson_samples.erase(poisson_samples.begin() + poisson_samples_target, poisson_samples.end());
     }
     for (const Vec2f &pt : poisson_samples) {
diff --git a/src/libslic3r/SLA/SLASupportTree.cpp b/src/libslic3r/SLA/SLASupportTree.cpp
index ac3b508316..5e0ac1c956 100644
--- a/src/libslic3r/SLA/SLASupportTree.cpp
+++ b/src/libslic3r/SLA/SLASupportTree.cpp
@@ -85,7 +85,7 @@ using Portion = std::tuple<double, double>;
 
 // Set this to true to enable full parallelism in this module.
 // Only the well tested parts will be concurrent if this is set to false.
-const constexpr bool USE_FULL_CONCURRENCY = false;
+const constexpr bool USE_FULL_CONCURRENCY = true;
 
 template<bool> struct _ccr {};
 
@@ -1194,7 +1194,7 @@ class SLASupportTree::Algorithm {
         // Now a and b vectors are perpendicular to v and to each other.
         // Together they define the plane where we have to iterate with the
         // given angles in the 'phis' vector
-        ccr_par::enumerate(phis.begin(), phis.end(),
+        ccr_seq::enumerate(phis.begin(), phis.end(),
                            [&hits, &m, sd, r_pin, r_back, s, a, b, c]
                            (double phi, size_t i)
         {
@@ -1297,7 +1297,7 @@ class SLASupportTree::Algorithm {
         // Hit results
         std::array<HitResult, SAMPLES> hits;
 
-        ccr_par::enumerate(phis.begin(), phis.end(),
+        ccr_seq::enumerate(phis.begin(), phis.end(),
                            [&m, a, b, sd, dir, r, s, ins_check, &hits]
                            (double phi, size_t i)
         {
@@ -2588,7 +2588,7 @@ SLASupportTree::SLASupportTree(double gnd_lvl): m_impl(new Impl()) {
 
 const TriangleMesh &SLASupportTree::merged_mesh() const
 {
-    return get().merged_mesh();
+    return m_impl->merged_mesh();
 }
 
 void SLASupportTree::merged_mesh_with_pad(TriangleMesh &outmesh) const {
diff --git a/src/libslic3r/SLA/SLASupportTreeIGL.cpp b/src/libslic3r/SLA/SLASupportTreeIGL.cpp
index d48b5bf739..95d4512710 100644
--- a/src/libslic3r/SLA/SLASupportTreeIGL.cpp
+++ b/src/libslic3r/SLA/SLASupportTreeIGL.cpp
@@ -148,9 +148,9 @@ std::vector<BoxIndexEl> BoxIndex::query(const BoundingBox &qrbb,
                                         BoxIndex::QueryType qt)
 {
     namespace bgi = boost::geometry::index;
-    
+
     std::vector<BoxIndexEl> ret; ret.reserve(m_impl->m_store.size());
-    
+
     switch (qt) {
     case qtIntersects:
         m_impl->m_store.query(bgi::intersects(qrbb), std::back_inserter(ret));
@@ -158,7 +158,7 @@ std::vector<BoxIndexEl> BoxIndex::query(const BoundingBox &qrbb,
     case qtWithin:
         m_impl->m_store.query(bgi::within(qrbb), std::back_inserter(ret));
     }
-    
+
     return ret;
 }
 
@@ -198,9 +198,9 @@ EigenMesh3D::EigenMesh3D(const TriangleMesh& tmesh): m_aabb(new AABBImpl()) {
     F.resize(stl.stats.number_of_facets, 3);
     for (unsigned int i = 0; i < stl.stats.number_of_facets; ++i) {
         const stl_facet &facet = stl.facet_start[i];
-		V.block<1, 3>(3 * i + 0, 0) = facet.vertex[0].cast<double>();
-		V.block<1, 3>(3 * i + 1, 0) = facet.vertex[1].cast<double>();
-		V.block<1, 3>(3 * i + 2, 0) = facet.vertex[2].cast<double>();
+        V.block<1, 3>(3 * i + 0, 0) = facet.vertex[0].cast<double>();
+        V.block<1, 3>(3 * i + 1, 0) = facet.vertex[1].cast<double>();
+        V.block<1, 3>(3 * i + 2, 0) = facet.vertex[2].cast<double>();
         F(i, 0) = int(3*i+0);
         F(i, 1) = int(3*i+1);
         F(i, 2) = int(3*i+2);
@@ -306,6 +306,7 @@ PointSet normals(const PointSet& points,
 
     PointSet            ret(range.size(), 3);
 
+//    for (size_t ridx = 0; ridx < range.size(); ++ridx)
     tbb::parallel_for(size_t(0), range.size(),
                       [&ret, &range, &mesh, &points, thr, eps](size_t ridx)
     {
diff --git a/src/libslic3r/SLAPrint.cpp b/src/libslic3r/SLAPrint.cpp
index 893d90bbf6..21aec83842 100644
--- a/src/libslic3r/SLAPrint.cpp
+++ b/src/libslic3r/SLAPrint.cpp
@@ -16,6 +16,12 @@
 // For geometry algorithms with native Clipper types (no copies and conversions)
 #include <libnest2d/backends/clipper/geometries.hpp>
 
+// #define SLAPRINT_DO_BENCHMARK
+
+#ifdef SLAPRINT_DO_BENCHMARK
+#include <libnest2d/tools/benchmark.h>
+#endif
+
 //#include <tbb/spin_mutex.h>//#include "tbb/mutex.h"
 
 #include "I18N.hpp"
@@ -686,6 +692,20 @@ std::string SLAPrint::validate() const
         }
     }
 
+    double expt_max = m_printer_config.max_exposure_time.getFloat();
+    double expt_min = m_printer_config.min_exposure_time.getFloat();
+    double expt_cur = m_material_config.exposure_time.getFloat();
+
+    if (expt_cur < expt_min || expt_cur > expt_max)
+        return L("Exposition time is out of printer profile bounds.");
+
+    double iexpt_max = m_printer_config.max_initial_exposure_time.getFloat();
+    double iexpt_min = m_printer_config.min_initial_exposure_time.getFloat();
+    double iexpt_cur = m_material_config.initial_exposure_time.getFloat();
+
+    if (iexpt_cur < iexpt_min || iexpt_cur > iexpt_max)
+        return L("Initial exposition time is out of printer profile bounds.");
+
     return "";
 }
 
@@ -1441,7 +1461,7 @@ void SLAPrint::process()
         if(canceled()) return;
 
         // Sequential version (for testing)
-        // for(unsigned l = 0; l < lvlcnt; ++l) process_level(l);
+        // for(unsigned l = 0; l < lvlcnt; ++l) lvlfn(l);
 
         // Print all the layers in parallel
         tbb::parallel_for<unsigned, decltype(lvlfn)>(0, lvlcnt, lvlfn);
@@ -1458,44 +1478,45 @@ void SLAPrint::process()
     using slaposFn = std::function<void(SLAPrintObject&)>;
     using slapsFn  = std::function<void(void)>;
 
-    std::array<slaposFn, slaposCount> pobj_program =
+    slaposFn pobj_program[] =
     {
-        slice_model,
-        support_points,
-        support_tree,
-        base_pool,
-        slice_supports
+        slice_model, support_points, support_tree, base_pool, slice_supports
     };
 
-    std::array<slapsFn, slapsCount> print_program =
-    {
-        merge_slices_and_eval_stats,
-        rasterize
+    // We want to first process all objects...
+    std::vector<SLAPrintObjectStep> level1_obj_steps = {
+        slaposObjectSlice, slaposSupportPoints, slaposSupportTree, slaposBasePool
     };
 
+    // and then slice all supports to allow preview to be displayed ASAP
+    std::vector<SLAPrintObjectStep> level2_obj_steps = {
+        slaposSliceSupports
+    };
+
+    slapsFn print_program[] = { merge_slices_and_eval_stats, rasterize };
+    SLAPrintStep print_steps[] = { slapsMergeSlicesAndEval, slapsRasterize };
+
     double st = min_objstatus;
-    unsigned incr = 0;
 
     BOOST_LOG_TRIVIAL(info) << "Start slicing process.";
 
-    // TODO: this loop could run in parallel but should not exhaust all the CPU
-    // power available
-    // Calculate the support structures first before slicing the supports,
-    // so that the preview will get displayed ASAP for all objects.
-    std::vector<SLAPrintObjectStep> step_ranges = {slaposObjectSlice,
-                                                   slaposSliceSupports,
-                                                   slaposCount};
+#ifdef SLAPRINT_DO_BENCHMARK
+    Benchmark bench;
+#else
+    struct {
+        void start() {} void stop() {} double getElapsedSec() { return .0; }
+    } bench;
+#endif
 
-    for (size_t idx_range = 0; idx_range + 1 < step_ranges.size(); ++idx_range) {
+    std::array<double, slaposCount + slapsCount> step_times {};
+
+    auto apply_steps_on_objects =
+        [this, &st, ostepd, &pobj_program, &step_times, &bench]
+        (const std::vector<SLAPrintObjectStep> &steps)
+    {
+        unsigned incr = 0;
         for (SLAPrintObject *po : m_objects) {
-
-            BOOST_LOG_TRIVIAL(info)
-                << "Slicing object " << po->model_object()->name;
-
-            for (int s = int(step_ranges[idx_range]);
-                 s < int(step_ranges[idx_range + 1]);
-                 ++s) {
-                auto currentstep = static_cast<SLAPrintObjectStep>(s);
+            for (SLAPrintObjectStep step : steps) {
 
                 // Cancellation checking. Each step will check for
                 // cancellation on its own and return earlier gracefully.
@@ -1505,39 +1526,38 @@ void SLAPrint::process()
 
                 st += incr * ostepd;
 
-                if (po->m_stepmask[currentstep]
-                    && po->set_started(currentstep)) {
-                    m_report_status(*this,
-                                    st,
-                                    OBJ_STEP_LABELS(currentstep));
-                    pobj_program[currentstep](*po);
+                if (po->m_stepmask[step] && po->set_started(step)) {
+                    m_report_status(*this, st, OBJ_STEP_LABELS(step));
+                    bench.start();
+                    pobj_program[step](*po);
+                    bench.stop();
+                    step_times[step] += bench.getElapsedSec();
                     throw_if_canceled();
-                    po->set_done(currentstep);
+                    po->set_done(step);
                 }
 
-                incr = OBJ_STEP_LEVELS[currentstep];
+                incr = OBJ_STEP_LEVELS[step];
             }
         }
-    }
-
-    std::array<SLAPrintStep, slapsCount> printsteps = {
-        slapsMergeSlicesAndEval, slapsRasterize
     };
 
+    apply_steps_on_objects(level1_obj_steps);
+    apply_steps_on_objects(level2_obj_steps);
+
     // this would disable the rasterization step
-    // m_stepmask[slapsRasterize] = false;
+    // std::fill(m_stepmask.begin(), m_stepmask.end(), false);
 
     double pstd = (100 - max_objstatus) / 100.0;
     st = max_objstatus;
-    for(size_t s = 0; s < print_program.size(); ++s) {
-        auto currentstep = printsteps[s];
-
+    for(SLAPrintStep currentstep : print_steps) {
         throw_if_canceled();
 
-        if(m_stepmask[currentstep] && set_started(currentstep))
-        {
+        if (m_stepmask[currentstep] && set_started(currentstep)) {
             m_report_status(*this, st, PRINT_STEP_LABELS(currentstep));
+            bench.start();
             print_program[currentstep]();
+            bench.stop();
+            step_times[slaposCount + currentstep] += bench.getElapsedSec();
             throw_if_canceled();
             set_done(currentstep);
         }
@@ -1547,6 +1567,21 @@ void SLAPrint::process()
 
     // If everything vent well
     m_report_status(*this, 100, L("Slicing done"));
+
+#ifdef SLAPRINT_DO_BENCHMARK
+    std::string csvbenchstr;
+    for (size_t i = 0; i < size_t(slaposCount); ++i)
+        csvbenchstr += OBJ_STEP_LABELS(i) + ";";
+
+    for (size_t i = 0; i < size_t(slapsCount); ++i)
+        csvbenchstr += PRINT_STEP_LABELS(i) + ";";
+
+    csvbenchstr += "\n";
+    for (double t : step_times) csvbenchstr += std::to_string(t) + ";";
+
+    std::cout << "Performance stats: \n" << csvbenchstr << std::endl;
+#endif
+
 }
 
 bool SLAPrint::invalidate_state_by_config_options(const std::vector<t_config_option_key> &opt_keys, bool &invalidate_all_model_objects)
@@ -1565,7 +1600,11 @@ bool SLAPrint::invalidate_state_by_config_options(const std::vector<t_config_opt
     // Cache the plenty of parameters, which influence the final rasterization only,
     // or they are only notes not influencing the rasterization step.
     static std::unordered_set<std::string> steps_rasterize = {
+        "min_exposure_time",
+        "max_exposure_time",
         "exposure_time",
+        "min_initial_exposure_time",
+        "max_initial_exposure_time",
         "initial_exposure_time",
         "display_width",
         "display_height",
diff --git a/src/libslic3r/Semver.cpp b/src/libslic3r/Semver.cpp
new file mode 100644
index 0000000000..5d36b39f72
--- /dev/null
+++ b/src/libslic3r/Semver.cpp
@@ -0,0 +1,7 @@
+#include "libslic3r.h"
+
+namespace Slic3r {
+
+Semver SEMVER { SLIC3R_VERSION };
+
+}
diff --git a/src/slic3r/Utils/Semver.hpp b/src/libslic3r/Semver.hpp
similarity index 100%
rename from src/slic3r/Utils/Semver.hpp
rename to src/libslic3r/Semver.hpp
diff --git a/src/libslic3r/Utils.hpp b/src/libslic3r/Utils.hpp
index b19027826b..2b1fdb2417 100644
--- a/src/libslic3r/Utils.hpp
+++ b/src/libslic3r/Utils.hpp
@@ -61,7 +61,7 @@ extern std::string normalize_utf8_nfc(const char *src);
 // Safely rename a file even if the target exists.
 // On Windows, the file explorer (or anti-virus or whatever else) often locks the file
 // for a short while, so the file may not be movable. Retry while we see recoverable errors.
-extern int rename_file(const std::string &from, const std::string &to);
+extern std::error_code rename_file(const std::string &from, const std::string &to);
 
 // Copy a file, adjust the access attributes, so that the target is writable.
 extern int copy_file(const std::string &from, const std::string &to);
diff --git a/src/libslic3r/libslic3r.h b/src/libslic3r/libslic3r.h
index dc2b6a4ec0..afbf94fa39 100644
--- a/src/libslic3r/libslic3r.h
+++ b/src/libslic3r/libslic3r.h
@@ -19,6 +19,7 @@
 #include <cmath>
 
 #include "Technologies.hpp"
+#include "Semver.hpp"
 
 typedef int32_t coord_t;
 typedef double  coordf_t;
@@ -92,6 +93,8 @@ inline std::string debug_out_path(const char *name, ...)
 
 namespace Slic3r {
 
+extern Semver SEMVER;
+
 template<typename T, typename Q>
 inline T unscale(Q v) { return T(v) * T(SCALING_FACTOR); }
 
diff --git a/src/libslic3r/utils.cpp b/src/libslic3r/utils.cpp
index 8fcd611acc..e26ed38394 100644
--- a/src/libslic3r/utils.cpp
+++ b/src/libslic3r/utils.cpp
@@ -173,67 +173,247 @@ const std::string& data_dir()
     return g_data_dir;
 }
 
+#ifdef _WIN32
+// The following helpers are borrowed from the LLVM project https://github.com/llvm
+namespace WindowsSupport
+{
+	template <typename HandleTraits>
+	class ScopedHandle {
+		typedef typename HandleTraits::handle_type handle_type;
+		handle_type Handle;
+		ScopedHandle(const ScopedHandle &other) = delete;
+		void operator=(const ScopedHandle &other) = delete;
+	public:
+		ScopedHandle() : Handle(HandleTraits::GetInvalid()) {}
+	  	explicit ScopedHandle(handle_type h) : Handle(h) {}
+	  	~ScopedHandle() { if (HandleTraits::IsValid(Handle)) HandleTraits::Close(Handle); }
+	  	handle_type take() {
+	    	handle_type t = Handle;
+	    	Handle = HandleTraits::GetInvalid();
+	    	return t;
+	  	}
+	  	ScopedHandle &operator=(handle_type h) {
+	    	if (HandleTraits::IsValid(Handle))
+	      		HandleTraits::Close(Handle);
+	    	Handle = h;
+	    	return *this;
+	  	}
+	  	// True if Handle is valid.
+	  	explicit operator bool() const { return HandleTraits::IsValid(Handle) ? true : false; }
+	  	operator handle_type() const { return Handle; }
+	};
+
+	struct CommonHandleTraits {
+	  	typedef HANDLE handle_type;
+	  	static handle_type GetInvalid() { return INVALID_HANDLE_VALUE; }
+	  	static void Close(handle_type h) { ::CloseHandle(h); }
+	  	static bool IsValid(handle_type h) { return h != GetInvalid(); }
+	};
+
+	typedef ScopedHandle<CommonHandleTraits> ScopedFileHandle;
+
+	std::error_code map_windows_error(unsigned windows_error_code)
+	{
+		#define MAP_ERR_TO_COND(x, y) case x: return std::make_error_code(std::errc::y)
+		switch (windows_error_code) {
+			MAP_ERR_TO_COND(ERROR_ACCESS_DENIED, permission_denied);
+			MAP_ERR_TO_COND(ERROR_ALREADY_EXISTS, file_exists);
+			MAP_ERR_TO_COND(ERROR_BAD_UNIT, no_such_device);
+			MAP_ERR_TO_COND(ERROR_BUFFER_OVERFLOW, filename_too_long);
+			MAP_ERR_TO_COND(ERROR_BUSY, device_or_resource_busy);
+			MAP_ERR_TO_COND(ERROR_BUSY_DRIVE, device_or_resource_busy);
+			MAP_ERR_TO_COND(ERROR_CANNOT_MAKE, permission_denied);
+			MAP_ERR_TO_COND(ERROR_CANTOPEN, io_error);
+			MAP_ERR_TO_COND(ERROR_CANTREAD, io_error);
+			MAP_ERR_TO_COND(ERROR_CANTWRITE, io_error);
+			MAP_ERR_TO_COND(ERROR_CURRENT_DIRECTORY, permission_denied);
+			MAP_ERR_TO_COND(ERROR_DEV_NOT_EXIST, no_such_device);
+			MAP_ERR_TO_COND(ERROR_DEVICE_IN_USE, device_or_resource_busy);
+			MAP_ERR_TO_COND(ERROR_DIR_NOT_EMPTY, directory_not_empty);
+			MAP_ERR_TO_COND(ERROR_DIRECTORY, invalid_argument);
+			MAP_ERR_TO_COND(ERROR_DISK_FULL, no_space_on_device);
+			MAP_ERR_TO_COND(ERROR_FILE_EXISTS, file_exists);
+			MAP_ERR_TO_COND(ERROR_FILE_NOT_FOUND, no_such_file_or_directory);
+			MAP_ERR_TO_COND(ERROR_HANDLE_DISK_FULL, no_space_on_device);
+			MAP_ERR_TO_COND(ERROR_INVALID_ACCESS, permission_denied);
+			MAP_ERR_TO_COND(ERROR_INVALID_DRIVE, no_such_device);
+			MAP_ERR_TO_COND(ERROR_INVALID_FUNCTION, function_not_supported);
+			MAP_ERR_TO_COND(ERROR_INVALID_HANDLE, invalid_argument);
+			MAP_ERR_TO_COND(ERROR_INVALID_NAME, invalid_argument);
+			MAP_ERR_TO_COND(ERROR_LOCK_VIOLATION, no_lock_available);
+			MAP_ERR_TO_COND(ERROR_LOCKED, no_lock_available);
+			MAP_ERR_TO_COND(ERROR_NEGATIVE_SEEK, invalid_argument);
+			MAP_ERR_TO_COND(ERROR_NOACCESS, permission_denied);
+			MAP_ERR_TO_COND(ERROR_NOT_ENOUGH_MEMORY, not_enough_memory);
+			MAP_ERR_TO_COND(ERROR_NOT_READY, resource_unavailable_try_again);
+			MAP_ERR_TO_COND(ERROR_OPEN_FAILED, io_error);
+			MAP_ERR_TO_COND(ERROR_OPEN_FILES, device_or_resource_busy);
+			MAP_ERR_TO_COND(ERROR_OUTOFMEMORY, not_enough_memory);
+			MAP_ERR_TO_COND(ERROR_PATH_NOT_FOUND, no_such_file_or_directory);
+			MAP_ERR_TO_COND(ERROR_BAD_NETPATH, no_such_file_or_directory);
+			MAP_ERR_TO_COND(ERROR_READ_FAULT, io_error);
+			MAP_ERR_TO_COND(ERROR_RETRY, resource_unavailable_try_again);
+			MAP_ERR_TO_COND(ERROR_SEEK, io_error);
+			MAP_ERR_TO_COND(ERROR_SHARING_VIOLATION, permission_denied);
+			MAP_ERR_TO_COND(ERROR_TOO_MANY_OPEN_FILES, too_many_files_open);
+			MAP_ERR_TO_COND(ERROR_WRITE_FAULT, io_error);
+			MAP_ERR_TO_COND(ERROR_WRITE_PROTECT, permission_denied);
+			MAP_ERR_TO_COND(WSAEACCES, permission_denied);
+			MAP_ERR_TO_COND(WSAEBADF, bad_file_descriptor);
+			MAP_ERR_TO_COND(WSAEFAULT, bad_address);
+			MAP_ERR_TO_COND(WSAEINTR, interrupted);
+			MAP_ERR_TO_COND(WSAEINVAL, invalid_argument);
+			MAP_ERR_TO_COND(WSAEMFILE, too_many_files_open);
+			MAP_ERR_TO_COND(WSAENAMETOOLONG, filename_too_long);
+		default:
+			return std::error_code(windows_error_code, std::system_category());
+		}
+		#undef MAP_ERR_TO_COND
+	}
+
+	static std::error_code rename_internal(HANDLE from_handle, const std::wstring &wide_to, bool replace_if_exists)
+	{
+		std::vector<char> rename_info_buf(sizeof(FILE_RENAME_INFO) - sizeof(wchar_t) + (wide_to.size() * sizeof(wchar_t)));
+		FILE_RENAME_INFO &rename_info = *reinterpret_cast<FILE_RENAME_INFO*>(rename_info_buf.data());
+		rename_info.ReplaceIfExists = replace_if_exists;
+		rename_info.RootDirectory = 0;
+		rename_info.FileNameLength = DWORD(wide_to.size() * sizeof(wchar_t));
+		std::copy(wide_to.begin(), wide_to.end(), &rename_info.FileName[0]);
+
+		::SetLastError(ERROR_SUCCESS);
+		if (! ::SetFileInformationByHandle(from_handle, FileRenameInfo, &rename_info, (DWORD)rename_info_buf.size())) {
+			unsigned Error = GetLastError();
+			if (Error == ERROR_SUCCESS)
+		  		Error = ERROR_CALL_NOT_IMPLEMENTED; // Wine doesn't always set error code.
+			return map_windows_error(Error);
+		}
+
+		return std::error_code();
+	}
+
+	static std::error_code real_path_from_handle(HANDLE H, std::wstring &buffer)
+	{
+		buffer.resize(MAX_PATH + 1);
+		DWORD CountChars = ::GetFinalPathNameByHandleW(H, (LPWSTR)buffer.data(), (DWORD)buffer.size() - 1, FILE_NAME_NORMALIZED);
+	  	if (CountChars > buffer.size()) {
+	    	// The buffer wasn't big enough, try again.  In this case the return value *does* indicate the size of the null terminator.
+	    	buffer.resize((size_t)CountChars);
+	    	CountChars = ::GetFinalPathNameByHandleW(H, (LPWSTR)buffer.data(), (DWORD)buffer.size() - 1, FILE_NAME_NORMALIZED);
+	  	}
+	  	if (CountChars == 0)
+	    	return map_windows_error(GetLastError());
+	  	buffer.resize(CountChars);
+	  	return std::error_code();
+	}
+
+	std::error_code rename(const std::string &from, const std::string &to)
+	{
+		// Convert to utf-16.
+		std::wstring wide_from = boost::nowide::widen(from);
+		std::wstring wide_to   = boost::nowide::widen(to);
+
+		ScopedFileHandle from_handle;
+		// Retry this a few times to defeat badly behaved file system scanners.
+		for (unsigned retry = 0; retry != 200; ++ retry) {
+			if (retry != 0)
+		  		::Sleep(10);
+			from_handle = ::CreateFileW((LPWSTR)wide_from.data(), GENERIC_READ | DELETE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+			if (from_handle)
+		  		break;
+		}
+		if (! from_handle)
+			return map_windows_error(GetLastError());
+
+		// We normally expect this loop to succeed after a few iterations. If it
+		// requires more than 200 tries, it's more likely that the failures are due to
+		// a true error, so stop trying.
+		for (unsigned retry = 0; retry != 200; ++ retry) {
+			auto errcode = rename_internal(from_handle, wide_to, true);
+
+			if (errcode == std::error_code(ERROR_CALL_NOT_IMPLEMENTED, std::system_category())) {
+		  		// Wine doesn't support SetFileInformationByHandle in rename_internal.
+		  		// Fall back to MoveFileEx.
+		  		if (std::error_code errcode2 = real_path_from_handle(from_handle, wide_from))
+		    		return errcode2;
+		  		if (::MoveFileExW((LPCWSTR)wide_from.data(), (LPCWSTR)wide_to.data(), MOVEFILE_REPLACE_EXISTING))
+		    		return std::error_code();
+		  		return map_windows_error(GetLastError());
+			}
+
+			if (! errcode || errcode != std::errc::permission_denied)
+		  		return errcode;
+
+			// The destination file probably exists and is currently open in another
+			// process, either because the file was opened without FILE_SHARE_DELETE or
+			// it is mapped into memory (e.g. using MemoryBuffer). Rename it in order to
+			// move it out of the way of the source file. Use FILE_FLAG_DELETE_ON_CLOSE
+			// to arrange for the destination file to be deleted when the other process
+			// closes it.
+			ScopedFileHandle to_handle(::CreateFileW((LPCWSTR)wide_to.data(), GENERIC_READ | DELETE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, NULL));
+			if (! to_handle) {
+				auto errcode = map_windows_error(GetLastError());
+				// Another process might have raced with us and moved the existing file
+				// out of the way before we had a chance to open it. If that happens, try
+				// to rename the source file again.
+				if (errcode == std::errc::no_such_file_or_directory)
+					continue;
+				return errcode;
+			}
+
+			BY_HANDLE_FILE_INFORMATION FI;
+			if (! ::GetFileInformationByHandle(to_handle, &FI))
+		  		return map_windows_error(GetLastError());
+
+			// Try to find a unique new name for the destination file.
+			for (unsigned unique_id = 0; unique_id != 200; ++ unique_id) {
+				std::wstring tmp_filename = wide_to + L".tmp" + std::to_wstring(unique_id);
+				std::error_code errcode = rename_internal(to_handle, tmp_filename, false);
+				if (errcode) {
+					if (errcode == std::make_error_code(std::errc::file_exists) || errcode == std::make_error_code(std::errc::permission_denied)) {
+						// Again, another process might have raced with us and moved the file
+						// before we could move it. Check whether this is the case, as it
+						// might have caused the permission denied error. If that was the
+						// case, we don't need to move it ourselves.
+						ScopedFileHandle to_handle2(::CreateFileW((LPCWSTR)wide_to.data(), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL));
+						if (! to_handle2) {
+							auto errcode = map_windows_error(GetLastError());
+							if (errcode == std::errc::no_such_file_or_directory)
+						  		break;
+							return errcode;
+						}
+						BY_HANDLE_FILE_INFORMATION FI2;
+						if (! ::GetFileInformationByHandle(to_handle2, &FI2))
+							return map_windows_error(GetLastError());
+						if (FI.nFileIndexHigh != FI2.nFileIndexHigh || FI.nFileIndexLow != FI2.nFileIndexLow || FI.dwVolumeSerialNumber != FI2.dwVolumeSerialNumber)
+							break;
+						continue;
+					}
+					return errcode;
+				}
+				break;
+			}
+
+			// Okay, the old destination file has probably been moved out of the way at
+			// this point, so try to rename the source file again. Still, another
+			// process might have raced with us to create and open the destination
+			// file, so we need to keep doing this until we succeed.
+		}
+
+		// The most likely root cause.
+		return std::make_error_code(std::errc::permission_denied);
+	}
+} // namespace WindowsSupport
+#endif /* _WIN32 */
 
 // borrowed from LVVM lib/Support/Windows/Path.inc
-int rename_file(const std::string &from, const std::string &to)
+std::error_code rename_file(const std::string &from, const std::string &to)
 {
-    int ec = 0;
-
 #ifdef _WIN32
-
-	// Convert to utf-16.
-    std::wstring wide_from = boost::nowide::widen(from);
-    std::wstring wide_to   = boost::nowide::widen(to);
-
-    // Retry while we see recoverable errors.
-    // System scanners (eg. indexer) might open the source file when it is written
-    // and closed.
-    bool TryReplace = true;
-
-    // This loop may take more than 2000 x 1ms to finish.
-    for (int i = 0; i < 2000; ++ i) {
-        if (i > 0)
-            // Sleep 1ms
-            ::Sleep(1);
-        if (TryReplace) {
-            // Try ReplaceFile first, as it is able to associate a new data stream
-            // with the destination even if the destination file is currently open.
-            if (::ReplaceFileW(wide_to.data(), wide_from.data(), NULL, 0, NULL, NULL))
-                return 0;
-            DWORD ReplaceError = ::GetLastError();
-            ec = -1; // ReplaceError
-            // If ReplaceFileW returned ERROR_UNABLE_TO_MOVE_REPLACEMENT or
-            // ERROR_UNABLE_TO_MOVE_REPLACEMENT_2, retry but only use MoveFileExW().
-            if (ReplaceError == ERROR_UNABLE_TO_MOVE_REPLACEMENT ||
-                ReplaceError == ERROR_UNABLE_TO_MOVE_REPLACEMENT_2) {
-                TryReplace = false;
-                continue;
-            }
-            // If ReplaceFileW returned ERROR_UNABLE_TO_REMOVE_REPLACED, retry
-            // using ReplaceFileW().
-            if (ReplaceError == ERROR_UNABLE_TO_REMOVE_REPLACED)
-                continue;
-            // We get ERROR_FILE_NOT_FOUND if the destination file is missing.
-            // MoveFileEx can handle this case.
-            if (ReplaceError != ERROR_ACCESS_DENIED && ReplaceError != ERROR_FILE_NOT_FOUND && ReplaceError != ERROR_SHARING_VIOLATION)
-                break;
-        }
-        if (::MoveFileExW(wide_from.c_str(), wide_to.c_str(), MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
-            return 0;
-        DWORD MoveError = ::GetLastError();
-        ec = -1; // MoveError
-        if (MoveError != ERROR_ACCESS_DENIED && MoveError != ERROR_SHARING_VIOLATION)
-            break;
-    }
-
+	return WindowsSupport::rename(from, to);
 #else
-
 	boost::nowide::remove(to.c_str());
-	ec = boost::nowide::rename(from.c_str(), to.c_str());
-
+	return std::make_error_code(static_cast<std::errc>(boost::nowide::rename(from.c_str(), to.c_str())));
 #endif
-
-    return ec;
 }
 
 int copy_file(const std::string &from, const std::string &to)
diff --git a/src/semver/CMakeLists.txt b/src/semver/CMakeLists.txt
index e3457bf291..c273121d49 100644
--- a/src/semver/CMakeLists.txt
+++ b/src/semver/CMakeLists.txt
@@ -5,3 +5,5 @@ add_library(semver STATIC
     semver.c
     semver.h
 )
+
+encoding_check(semver)
diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index e3a910d6d2..b3e2990f91 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -163,6 +163,8 @@ endif ()
 
 add_library(libslic3r_gui STATIC ${SLIC3R_GUI_SOURCES})
 
+encoding_check(libslic3r_gui)
+
 target_link_libraries(libslic3r_gui libslic3r avrdude cereal imgui ${GLEW_LIBRARIES})
 if (SLIC3R_PCH AND NOT SLIC3R_SYNTAXONLY)
     add_precompiled_header(libslic3r_gui pchheader.hpp FORCEINCLUDE)
diff --git a/src/slic3r/Config/Snapshot.cpp b/src/slic3r/Config/Snapshot.cpp
index b208554b50..3757ec25b3 100644
--- a/src/slic3r/Config/Snapshot.cpp
+++ b/src/slic3r/Config/Snapshot.cpp
@@ -366,7 +366,7 @@ const Snapshot&	SnapshotDB::take_snapshot(const AppConfig &app_config, Snapshot:
 	// Snapshot header.
 	snapshot.time_captured 			 = Slic3r::Utils::get_current_time_utc();
 	snapshot.id 					 = Slic3r::Utils::format_time_ISO8601Z(snapshot.time_captured);
-	snapshot.slic3r_version_captured = *Semver::parse(SLIC3R_VERSION);     // XXX:  have Semver Slic3r version
+	snapshot.slic3r_version_captured = Slic3r::SEMVER;
 	snapshot.comment 				 = comment;
 	snapshot.reason 				 = reason;
 	// Active presets at the time of the snapshot.
diff --git a/src/slic3r/Config/Snapshot.hpp b/src/slic3r/Config/Snapshot.hpp
index a916dfe92a..9a73916916 100644
--- a/src/slic3r/Config/Snapshot.hpp
+++ b/src/slic3r/Config/Snapshot.hpp
@@ -8,8 +8,8 @@
 
 #include <boost/filesystem.hpp>
 
+#include "libslic3r/Semver.hpp"
 #include "Version.hpp"
-#include "../Utils/Semver.hpp"
 
 namespace Slic3r { 
 
diff --git a/src/slic3r/Config/Version.cpp b/src/slic3r/Config/Version.cpp
index 865884c6fe..175abff69a 100644
--- a/src/slic3r/Config/Version.cpp
+++ b/src/slic3r/Config/Version.cpp
@@ -15,7 +15,6 @@ namespace Slic3r {
 namespace GUI {
 namespace Config {
 
-static const Semver s_current_slic3r_semver(SLIC3R_VERSION);
 
 // Optimized lexicographic compare of two pre-release versions, ignoring the numeric suffix.
 static int compare_prerelease(const char *p1, const char *p2)
@@ -64,7 +63,7 @@ bool Version::is_slic3r_supported(const Semver &slic3r_version) const
 
 bool Version::is_current_slic3r_supported() const
 {
-	return this->is_slic3r_supported(s_current_slic3r_semver);
+	return this->is_slic3r_supported(Slic3r::SEMVER);
 }
 
 #if 0
diff --git a/src/slic3r/Config/Version.hpp b/src/slic3r/Config/Version.hpp
index 560bc29c21..19c565ffb4 100644
--- a/src/slic3r/Config/Version.hpp
+++ b/src/slic3r/Config/Version.hpp
@@ -7,7 +7,7 @@
 #include <boost/filesystem.hpp>
 
 #include "libslic3r/FileParserError.hpp"
-#include "../Utils/Semver.hpp"
+#include "libslic3r/Semver.hpp"
 
 namespace Slic3r { 
 namespace GUI {
diff --git a/src/slic3r/GUI/3DBed.cpp b/src/slic3r/GUI/3DBed.cpp
index 97e200b38e..5b7473980f 100644
--- a/src/slic3r/GUI/3DBed.cpp
+++ b/src/slic3r/GUI/3DBed.cpp
@@ -609,10 +609,12 @@ void Bed3D::render_default(bool bottom) const
         if (!has_model && !bottom)
         {
             // draw background
+            glsafe(::glDepthMask(GL_FALSE));
             glsafe(::glColor4f(0.35f, 0.35f, 0.35f, 0.4f));
             glsafe(::glNormal3d(0.0f, 0.0f, 1.0f));
             glsafe(::glVertexPointer(3, GL_FLOAT, m_triangles.get_vertex_data_size(), (GLvoid*)m_triangles.get_vertices_data()));
             glsafe(::glDrawArrays(GL_TRIANGLES, 0, (GLsizei)triangles_vcount));
+            glsafe(::glDepthMask(GL_TRUE));
         }
 
         // draw grid
diff --git a/src/slic3r/GUI/AboutDialog.cpp b/src/slic3r/GUI/AboutDialog.cpp
index d2c76366b7..a4453c73ea 100644
--- a/src/slic3r/GUI/AboutDialog.cpp
+++ b/src/slic3r/GUI/AboutDialog.cpp
@@ -76,9 +76,9 @@ void CopyrightsDialog::fill_entries()
 {
     m_entries = {
         { "wxWidgets"       , "2019 wxWidgets"                              , "https://www.wxwidgets.org/" },
-        { "OpenGL"          , "1997-2019 The Khronos™ Group Inc"            , "https://www.opengl.org/" },
+        { "OpenGL"          , "1997-2019 The Khronosâ„¢ Group Inc"            , "https://www.opengl.org/" },
         { "GNU gettext"     , "1998, 2019 Free Software Foundation, Inc."   , "https://www.gnu.org/software/gettext/" },
-        { "PoEdit"          , "2019 Václav Slavík"                          , "https://poedit.net/" },
+        { "PoEdit"          , "2019 Václav Slavík"                          , "https://poedit.net/" },
         { "ImGUI"           , "2014-2019 Omar Cornut"                       , "https://github.com/ocornut/imgui" },
         { "Eigen"           , ""                                            , "http://eigen.tuxfamily.org" },
         { "ADMesh"          , "1995, 1996  Anthony D. Martin; "
@@ -110,7 +110,9 @@ void CopyrightsDialog::fill_entries()
                                     , "Based on original by fabian \"ryg\" giesen v1.04. "
                               "Custom version, modified by Yann Collet"     , "https://github.com/Cyan4973/RygsDXTc" },
         { "Icons for STL and GCODE files."
-                            , "Akira Yasuda"                                , "http://3dp0.com/icons-for-stl-and-gcode/" }
+                            , "Akira Yasuda"                                , "http://3dp0.com/icons-for-stl-and-gcode/" },
+        { "AppImage packaging for Linux using AppImageKit"
+                            , "2004-2019 Simon Peter and contributors"      , "https://appimage.org/" }
     };
 }
 
diff --git a/src/slic3r/GUI/AppConfig.cpp b/src/slic3r/GUI/AppConfig.cpp
index dfdc79677d..96213447cf 100644
--- a/src/slic3r/GUI/AppConfig.cpp
+++ b/src/slic3r/GUI/AppConfig.cpp
@@ -15,9 +15,13 @@
 #include <boost/nowide/fstream.hpp>
 #include <boost/property_tree/ini_parser.hpp>
 #include <boost/property_tree/ptree.hpp>
+#include <boost/property_tree/exceptions.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/format.hpp>
 
+#include <wx/string.h>
+#include "I18N.hpp"
+
 namespace Slic3r {
 
 static const std::string VENDOR_PREFIX = "vendor:";
@@ -58,7 +62,7 @@ void AppConfig::set_defaults()
     if (!get("use_legacy_opengl").empty())
         erase("", "use_legacy_opengl");
 
-#if __APPLE__
+#ifdef __APPLE__
     if (get("use_retina_opengl").empty())
         set("use_retina_opengl", "1");
 #endif
@@ -90,7 +94,15 @@ void AppConfig::load()
     namespace pt = boost::property_tree;
     pt::ptree tree;
     boost::nowide::ifstream ifs(AppConfig::config_path());
-    pt::read_ini(ifs, tree);
+    try {
+        pt::read_ini(ifs, tree);
+    } catch (pt::ptree_error& ex) {
+        // Error while parsing config file. We'll customize the error message and rethrow to be displayed.
+        throw std::runtime_error(
+        	_utf8(L("Error parsing PrusaSlicer config file, it is probably corrupted. "
+                    "Try to manualy delete the file to recover from the error. Your user profiles will not be affected.")) + 
+        	"\n\n" + AppConfig::config_path() + "\n\n" + ex.what());
+    }
 
     // 2) Parse the property_tree, extract the sections and key / value pairs.
     for (const auto &section : tree) {
diff --git a/src/slic3r/GUI/AppConfig.hpp b/src/slic3r/GUI/AppConfig.hpp
index 230a922940..8ad17b9db8 100644
--- a/src/slic3r/GUI/AppConfig.hpp
+++ b/src/slic3r/GUI/AppConfig.hpp
@@ -6,7 +6,7 @@
 #include <string>
 
 #include "libslic3r/Config.hpp"
-#include "slic3r/Utils/Semver.hpp"
+#include "libslic3r/Semver.hpp"
 
 namespace Slic3r {
 
diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index b77a272e2e..94ddb1e5ef 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -151,7 +151,12 @@ void BackgroundSlicingProcess::thread_proc()
 		} catch (CanceledException & /* ex */) {
 			// Canceled, this is all right.
 			assert(m_print->canceled());
-		} catch (std::exception &ex) {
+        } catch (const std::bad_alloc& ex) {
+            wxString errmsg = wxString::Format(_(L("%s has encountered an error. It was likely caused by running out of memory. "
+                                  "If you are sure you have enough RAM on your system, this may also be a bug and we would "
+                                  "be glad if you reported it.")), SLIC3R_APP_NAME);
+            error = errmsg.ToStdString() + "\n\n" + std::string(ex.what());
+        } catch (std::exception &ex) {
 			error = ex.what();
 		} catch (...) {
 			error = "Unknown C++ exception.";
diff --git a/src/slic3r/GUI/ConfigWizard.cpp b/src/slic3r/GUI/ConfigWizard.cpp
index 6a70cb9fdb..0115ff5f9c 100644
--- a/src/slic3r/GUI/ConfigWizard.cpp
+++ b/src/slic3r/GUI/ConfigWizard.cpp
@@ -25,6 +25,7 @@
 #include "PresetBundle.hpp"
 #include "GUI.hpp"
 #include "GUI_Utils.hpp"
+#include "slic3r/Config/Snapshot.hpp"
 #include "slic3r/Utils/PresetUpdater.hpp"
 
 
@@ -32,6 +33,10 @@ namespace Slic3r {
 namespace GUI {
 
 
+using Config::Snapshot;
+using Config::SnapshotDB;
+
+
 // Printer model picker GUI control
 
 struct PrinterPickerEvent : public wxEvent
@@ -1025,15 +1030,33 @@ void ConfigWizard::priv::apply_config(AppConfig *app_config, PresetBundle *prese
 
     // Decide whether to create snapshot based on run_reason and the reset profile checkbox
     bool snapshot = true;
+    Snapshot::Reason snapshot_reason = Snapshot::SNAPSHOT_UPGRADE;
     switch (run_reason) {
-        case ConfigWizard::RR_DATA_EMPTY:    snapshot = false; break;
-        case ConfigWizard::RR_DATA_LEGACY:   snapshot = true; break;
-        case ConfigWizard::RR_DATA_INCOMPAT: snapshot = false; break;      // In this case snapshot is done by PresetUpdater with the appropriate reason
-        case ConfigWizard::RR_USER:          snapshot = page_welcome->reset_user_profile(); break;
+        case ConfigWizard::RR_DATA_EMPTY:
+            snapshot = false;
+            break;
+        case ConfigWizard::RR_DATA_LEGACY:
+            snapshot = true;
+            break;
+        case ConfigWizard::RR_DATA_INCOMPAT:
+            // In this case snapshot has already been taken by
+            // PresetUpdater with the appropriate reason
+            snapshot = false;
+            break;
+        case ConfigWizard::RR_USER:
+            snapshot = page_welcome->reset_user_profile();
+            snapshot_reason = Snapshot::SNAPSHOT_USER;
+            break;
     }
+
+    if (snapshot) {
+        SnapshotDB::singleton().take_snapshot(*app_config, snapshot_reason);
+    }
+
     if (install_bundles.size() > 0) {
         // Install bundles from resources.
-        updater->install_bundles_rsrc(std::move(install_bundles), snapshot);
+        // Don't create snapshot - we've already done that above if applicable.
+        updater->install_bundles_rsrc(std::move(install_bundles), false);
     } else {
         BOOST_LOG_TRIVIAL(info) << "No bundles need to be installed from resources";
     }
diff --git a/src/slic3r/GUI/Field.cpp b/src/slic3r/GUI/Field.cpp
index c16186f9a6..5ea674738b 100644
--- a/src/slic3r/GUI/Field.cpp
+++ b/src/slic3r/GUI/Field.cpp
@@ -206,8 +206,8 @@ void Field::get_value_by_opt_type(wxString& str)
                 const wxString msg_text = wxString::Format(_(L("Do you mean %s%% instead of %s %s?\n"
                     "Select YES if you want to change this value to %s%%, \n"
                     "or NO if you are sure that %s %s is a correct value.")), stVal, stVal, sidetext, stVal, stVal, sidetext);
-                auto dialog = new wxMessageDialog(m_parent, msg_text, _(L("Parameter validation")), wxICON_WARNING | wxYES | wxNO);
-                if (dialog->ShowModal() == wxID_YES) {
+                wxMessageDialog dialog(m_parent, msg_text, _(L("Parameter validation")), wxICON_WARNING | wxYES | wxNO);
+                if (dialog.ShowModal() == wxID_YES) {
                     set_value(wxString::Format("%s%%", stVal), false/*true*/);
                     str += "%%";
                 }
@@ -559,7 +559,16 @@ void SpinCtrl::BUILD() {
 		break;
 	}
 
-    const int min_val = m_opt.min == INT_MIN ? 0: m_opt.min;
+    const int min_val = m_opt.min == INT_MIN 
+#ifdef __WXOSX__
+    // We will forcibly set the input value for SpinControl, since the value 
+    // inserted from the keyboard is not updated under OSX.
+    // So, we can't set min control value bigger then 0.
+    // Otherwise, it couldn't be possible to input from keyboard value 
+    // less then min_val.
+    || m_opt.min > 0 
+#endif
+    ? 0 : m_opt.min;
 	const int max_val = m_opt.max < 2147483647 ? m_opt.max : 2147483647;
 
 	auto temp = new wxSpinCtrl(m_parent, wxID_ANY, text_value, wxDefaultPosition, size,
@@ -628,16 +637,24 @@ void SpinCtrl::BUILD() {
 
 void SpinCtrl::propagate_value()
 {
-    if (suppress_propagating)
+    if (suppress_propagation)
         return;
 
-    suppress_propagating = true;
+    suppress_propagation = true;
     if (tmp_value == UNDEF_VALUE) {
         on_kill_focus();
 	} else {
+#ifdef __WXOSX__
+        // check input value for minimum
+        if (m_opt.min > 0 && tmp_value < m_opt.min) {
+            wxSpinCtrl* spin = static_cast<wxSpinCtrl*>(window);
+            spin->SetValue(m_opt.min);
+            spin->GetText()->SetInsertionPointEnd();
+        }
+#endif
         on_change_field();
     }
-    suppress_propagating = false;
+    suppress_propagation = false;
 }
 
 void SpinCtrl::msw_rescale()
@@ -1021,11 +1038,12 @@ void ColourPicker::BUILD()
 	// Validate the color
 	wxString clr_str(m_opt.get_default_value<ConfigOptionStrings>()->get_at(m_opt_idx));
 	wxColour clr(clr_str);
-	if (! clr.IsOk()) {
+	if (clr_str.IsEmpty() || !clr.IsOk()) {
 		clr = wxTransparentColour;
 	}
 
 	auto temp = new wxColourPickerCtrl(m_parent, wxID_ANY, clr, wxDefaultPosition, size);
+    temp->SetFont(Slic3r::GUI::wxGetApp().normal_font());
 	temp->SetBackgroundStyle(wxBG_STYLE_PAINT);
 
 	// 	// recast as a wxWindow to fit the calling convention
@@ -1036,17 +1054,59 @@ void ColourPicker::BUILD()
 	temp->SetToolTip(get_tooltip_text(clr_str));
 }
 
+void ColourPicker::set_undef_value(wxColourPickerCtrl* field)
+{
+    field->SetColour(wxTransparentColour);
+
+    wxButton* btn = dynamic_cast<wxButton*>(field->GetPickerCtrl());
+    wxBitmap bmp = btn->GetBitmap();
+    wxMemoryDC dc(bmp);
+    dc.SetTextForeground(*wxWHITE);
+    dc.SetFont(wxGetApp().normal_font());
+
+    const wxRect rect = wxRect(0, 0, bmp.GetWidth(), bmp.GetHeight());
+    dc.DrawLabel("undef", rect, wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL);
+
+    dc.SelectObject(wxNullBitmap);
+    btn->SetBitmapLabel(bmp);
+}
+
+void ColourPicker::set_value(const boost::any& value, bool change_event)
+{
+    m_disable_change_event = !change_event;
+    const wxString clr_str(boost::any_cast<wxString>(value));
+    auto field = dynamic_cast<wxColourPickerCtrl*>(window);
+
+    wxColour clr(clr_str);
+    if (clr_str.IsEmpty() || !clr.IsOk())
+        set_undef_value(field);
+    else
+        field->SetColour(clr);
+
+    m_disable_change_event = false;
+}
+
 boost::any& ColourPicker::get_value()
 {
-// 	boost::any m_value;
-
 	auto colour = static_cast<wxColourPickerCtrl*>(window)->GetColour();
-	auto clr_str = wxString::Format(wxT("#%02X%02X%02X"), colour.Red(), colour.Green(), colour.Blue());
-	m_value = clr_str.ToStdString();
-
+    if (colour == wxTransparentColour)
+        m_value = std::string("");
+    else {
+		auto clr_str = wxString::Format(wxT("#%02X%02X%02X"), colour.Red(), colour.Green(), colour.Blue());
+		m_value = clr_str.ToStdString();
+    }
 	return m_value;
 }
 
+void ColourPicker::msw_rescale()
+{
+    Field::msw_rescale();
+
+    wxColourPickerCtrl* field = dynamic_cast<wxColourPickerCtrl*>(window);
+    if (field->GetColour() == wxTransparentColour)
+        set_undef_value(field);
+}
+
 void PointCtrl::BUILD()
 {
 	auto temp = new wxBoxSizer(wxHORIZONTAL);
diff --git a/src/slic3r/GUI/Field.hpp b/src/slic3r/GUI/Field.hpp
index ca0d74f376..11775a67c7 100644
--- a/src/slic3r/GUI/Field.hpp
+++ b/src/slic3r/GUI/Field.hpp
@@ -406,6 +406,8 @@ public:
 
 class ColourPicker : public Field {
 	using Field::Field;
+
+    void            set_undef_value(wxColourPickerCtrl* field);
 public:
 	ColourPicker(const ConfigOptionDef& opt, const t_config_option_key& id) : Field(opt, id) {}
 	ColourPicker(wxWindow* parent, const ConfigOptionDef& opt, const t_config_option_key& id) : Field(parent, opt, id) {}
@@ -419,13 +421,9 @@ public:
 		dynamic_cast<wxColourPickerCtrl*>(window)->SetColour(value);
 		m_disable_change_event = false;
 	 	}
-	void			set_value(const boost::any& value, bool change_event = false) {
-		m_disable_change_event = !change_event;
-		dynamic_cast<wxColourPickerCtrl*>(window)->SetColour(boost::any_cast<wxString>(value));
-		m_disable_change_event = false;
-	}
-
+	void			set_value(const boost::any& value, bool change_event = false) override;
 	boost::any&		get_value() override;
+    void            msw_rescale() override;
 
 	void			enable() override { dynamic_cast<wxColourPickerCtrl*>(window)->Enable(); };
 	void			disable() override{ dynamic_cast<wxColourPickerCtrl*>(window)->Disable(); };
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index a5906f619b..981cb38a93 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -2474,6 +2474,13 @@ void GLCanvas3D::on_mouse_wheel(wxMouseEvent& evt)
     evt.SetY(evt.GetY() * scale);
 #endif
 
+#ifdef __WXMSW__
+	// For some reason the Idle event is not being generated after the mouse scroll event in case of scrolling with the two fingers on the touch pad,
+	// if the event is not allowed to be passed further.
+	// https://github.com/prusa3d/PrusaSlicer/issues/2750
+	evt.Skip();
+#endif /* __WXMSW__ */
+
     // Performs layers editing updates, if enabled
     if (is_layers_editing_enabled())
     {
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 066dab90fd..dff9fc1a97 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -126,7 +126,16 @@ static void generic_exception_handle()
 
     try {
         throw;
-    } catch (const std::exception &ex) {
+    } catch (const std::bad_alloc& ex) {
+        // bad_alloc in main thread is most likely fatal. Report immediately to the user (wxLogError would be delayed)
+        // and terminate the app so it is at least certain to happen now.
+        wxString errmsg = wxString::Format(_(L("%s has encountered an error. It was likely caused by running out of memory. "
+                              "If you are sure you have enough RAM on your system, this may also be a bug and we would "
+                              "be glad if you reported it.\n\nThe application will now terminate.")), SLIC3R_APP_NAME);
+        wxMessageBox(errmsg + "\n\n" + wxString(ex.what()), _(L("Fatal error")), wxOK | wxICON_ERROR);
+        BOOST_LOG_TRIVIAL(error) << boost::format("std::bad_alloc exception: %1%") % ex.what();
+        std::terminate();
+    } catch (const std::exception& ex) {
         wxLogError("Internal error: %s", ex.what());
         BOOST_LOG_TRIVIAL(error) << boost::format("Uncaught exception: %1%") % ex.what();
         throw;
@@ -284,6 +293,20 @@ bool GUI_App::on_init_inner()
                 config_wizard_startup(app_conf_exists);
                 preset_updater->slic3r_update_notify();
                 preset_updater->sync(preset_bundle);
+                const GLCanvas3DManager::GLInfo &glinfo = GLCanvas3DManager::get_gl_info();
+                if (! glinfo.is_version_greater_or_equal_to(2, 0)) {
+                	// Complain about the OpenGL version.
+                	wxString message = wxString::Format(
+                		_(L("PrusaSlicer requires OpenGL 2.0 capable graphics driver to run correctly, \n"
+                			"while OpenGL version %s, render %s, vendor %s was detected.")), wxString(glinfo.get_version()), wxString(glinfo.get_renderer()), wxString(glinfo.get_vendor()));
+                	message += "\n";
+                	message += _(L("You may need to update your graphics card driver."));
+#ifdef _WIN32
+                	message += "\n";
+                	message += _(L("As a workaround, you may run PrusaSlicer with a software rendered 3D graphics by running prusa-slicer.exe with the --sw_renderer parameter."));
+#endif
+                	wxMessageBox(message, wxString("PrusaSlicer - ") + _(L("Unsupported OpenGL version")), wxOK | wxICON_ERROR);
+                }
             });
         }
     });
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 3d5efe63fc..e0bdd26df9 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -134,7 +134,11 @@ ObjectList::ObjectList(wxWindow* parent) :
         selection_changed();
 #ifndef __WXMSW__
         set_tooltip_for_item(get_mouse_position_in_control());
-#endif //__WXMSW__        
+#endif //__WXMSW__
+
+#ifndef __WXOSX__
+        list_manipulation();
+#endif //__WXOSX__
     });
 
 #ifdef __WXOSX__
@@ -169,7 +173,7 @@ ObjectList::ObjectList(wxWindow* parent) :
 
 #ifdef __WXMSW__
     GetMainWindow()->Bind(wxEVT_MOTION, [this](wxMouseEvent& event) {
-        set_tooltip_for_item(/*event.GetPosition()*/get_mouse_position_in_control());
+        set_tooltip_for_item(get_mouse_position_in_control());
         event.Skip();
     });
 #endif //__WXMSW__
@@ -330,28 +334,34 @@ void ObjectList::set_tooltip_for_item(const wxPoint& pt)
      * Just this->SetToolTip(tooltip) => has no effect.
      */
 
-    if (!item)
+    if (!item || GetSelectedItemsCount() > 1)
     {
         GetMainWindow()->SetToolTip(""); // hide tooltip
         return;
     }
 
-    if (col->GetTitle() == _(L("Editing")) && GetSelectedItemsCount()<2)
-        GetMainWindow()->SetToolTip(_(L("Right button click the icon to change the object settings")));
-    else if (col->GetTitle() == _("Name"))
-    {
-#ifdef __WXMSW__
-        if (pt.x < 2 * wxGetApp().em_unit() || pt.x > 4 * wxGetApp().em_unit()) {
-            GetMainWindow()->SetToolTip(""); // hide tooltip
-            return;
-        }
+    wxString tooltip = "";
+
+    if (col->GetTitle() == _(L("Editing")))
+#ifdef __WXOSX__
+        tooltip = _(L("Right button click the icon to change the object settings"));
+#else
+        tooltip = _(L("Click the icon to change the object settings"));
 #endif //__WXMSW__
+    else if (col->GetTitle() == " ")
+#ifdef __WXOSX__
+        tooltip = _(L("Right button click the icon to change the object printable property"));
+#else
+        tooltip = _(L("Click the icon to change the object printable property"));
+#endif //__WXMSW__
+    else if (col->GetTitle() == _("Name") && (pt.x >= 2 * wxGetApp().em_unit() && pt.x <= 4 * wxGetApp().em_unit()))
+    {
         int obj_idx, vol_idx;
         get_selected_item_indexes(obj_idx, vol_idx, item);
-        GetMainWindow()->SetToolTip(get_mesh_errors_list(obj_idx, vol_idx));
+        tooltip = get_mesh_errors_list(obj_idx, vol_idx);
     }
-    else
-        GetMainWindow()->SetToolTip(""); // hide tooltip
+    
+    GetMainWindow()->SetToolTip(tooltip);
 }
 
 wxPoint ObjectList::get_mouse_position_in_control()
@@ -744,6 +754,11 @@ void ObjectList::OnChar(wxKeyEvent& event)
 #endif /* __WXOSX__ */
 
 void ObjectList::OnContextMenu(wxDataViewEvent&)
+{
+    list_manipulation();
+}
+
+void ObjectList::list_manipulation()
 {
     wxDataViewItem item;
     wxDataViewColumn* col;
@@ -2291,14 +2306,14 @@ void ObjectList::add_object_to_list(size_t obj_idx, bool call_selection_changed)
     {
         std::vector<bool> print_idicator(model_object->instances.size());
         for (int i = 0; i < model_object->instances.size(); ++i)
-            print_idicator[i] = model_object->instances[i]->is_printable();
+            print_idicator[i] = model_object->instances[i]->printable;
 
         const wxDataViewItem object_item = m_objects_model->GetItemById(obj_idx);
         m_objects_model->AddInstanceChild(object_item, print_idicator);
         Expand(m_objects_model->GetInstanceRootItem(object_item));
     }
     else
-        m_objects_model->SetPrintableState(model_object->instances[0]->is_printable() ? piPrintable : piUnprintable, obj_idx);
+        m_objects_model->SetPrintableState(model_object->instances[0]->printable ? piPrintable : piUnprintable, obj_idx);
 
     // add settings to the object, if it has those
     add_settings_item(item, &model_object->config);
diff --git a/src/slic3r/GUI/GUI_ObjectList.hpp b/src/slic3r/GUI/GUI_ObjectList.hpp
index bdec060818..62003e5571 100644
--- a/src/slic3r/GUI/GUI_ObjectList.hpp
+++ b/src/slic3r/GUI/GUI_ObjectList.hpp
@@ -358,6 +358,7 @@ private:
 //    void OnChar(wxKeyEvent& event);
 #endif /* __WXOSX__ */
     void OnContextMenu(wxDataViewEvent &event);
+    void list_manipulation();
 
     void OnBeginDrag(wxDataViewEvent &event);
     void OnDropPossible(wxDataViewEvent &event);
diff --git a/src/slic3r/GUI/GUI_ObjectManipulation.cpp b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
index 2bbf11170e..29013389e5 100644
--- a/src/slic3r/GUI/GUI_ObjectManipulation.cpp
+++ b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
@@ -153,8 +153,8 @@ ObjectManipulation::ObjectManipulation(wxWindow* parent) :
 
     auto manifold_warning_icon = [this](wxWindow* parent) {
         m_fix_throught_netfab_bitmap = new wxStaticBitmap(parent, wxID_ANY, wxNullBitmap);
-        auto sizer = new wxBoxSizer(wxHORIZONTAL);
-        sizer->Add(m_fix_throught_netfab_bitmap);
+//         auto sizer = new wxBoxSizer(wxHORIZONTAL);
+//         sizer->Add(m_fix_throught_netfab_bitmap);
 
         if (is_windows10())
             m_fix_throught_netfab_bitmap->Bind(wxEVT_CONTEXT_MENU, [this](wxCommandEvent &e)
@@ -167,17 +167,19 @@ ObjectManipulation::ObjectManipulation(wxWindow* parent) :
                 update_warning_icon_state(wxGetApp().obj_list()->get_mesh_errors_list());
             });
 
-        return sizer;
+//         return sizer;
+        return m_fix_throught_netfab_bitmap;
     };
 
-    line.append_widget(manifold_warning_icon);
+ //   line.append_widget(manifold_warning_icon);
+    line.near_label_widget = manifold_warning_icon;
     def.label = "";
     def.gui_type = "legend";
     def.tooltip = L("Object name");
 #ifdef __APPLE__
-    def.width = 19;
+    def.width = 20;
 #else
-    def.width = 21;
+    def.width = 22;
 #endif
     def.set_default_value(new ConfigOptionString{ " " });
     line.append_option(Option(def, "object_name"));
@@ -392,10 +394,19 @@ ObjectManipulation::ObjectManipulation(wxWindow* parent) :
 
     // call back for a rescale of button "Set uniform scale"
     m_og->rescale_near_label_widget = [this](wxWindow* win) {
+        // rescale lock icon
         auto *ctrl = dynamic_cast<LockButton*>(win);
-        if (ctrl == nullptr)
+        if (ctrl != nullptr) {
+            ctrl->msw_rescale();
             return;
-        ctrl->msw_rescale();
+        }
+
+        if (win == m_fix_throught_netfab_bitmap)
+            return;
+
+        // rescale "place" of the empty icon (to correct layout of the "Size" and "Scale")
+        if (dynamic_cast<wxStaticBitmap*>(win) != nullptr)
+            win->SetMinSize(create_scaled_bitmap(m_parent, "one_layer_lock_on.png").GetSize());
     };
 }
  
@@ -685,6 +696,7 @@ void ObjectManipulation::emulate_kill_focus()
 void ObjectManipulation::update_warning_icon_state(const wxString& tooltip)
 {
     m_fix_throught_netfab_bitmap->SetBitmap(tooltip.IsEmpty() ? wxNullBitmap : m_manifold_warning_bmp.bmp());
+    m_fix_throught_netfab_bitmap->SetMinSize(tooltip.IsEmpty() ? wxSize(0,0) : m_manifold_warning_bmp.bmp().GetSize());
     m_fix_throught_netfab_bitmap->SetToolTip(tooltip);
 }
 
@@ -919,7 +931,10 @@ void ObjectManipulation::msw_rescale()
 {
     msw_rescale_word_local_combo(m_word_local_combo);
     m_manifold_warning_bmp.msw_rescale();
-    m_fix_throught_netfab_bitmap->SetBitmap(m_manifold_warning_bmp.bmp());
+
+    const wxString& tooltip = m_fix_throught_netfab_bitmap->GetToolTipText();
+    m_fix_throught_netfab_bitmap->SetBitmap(tooltip.IsEmpty() ? wxNullBitmap : m_manifold_warning_bmp.bmp());
+    m_fix_throught_netfab_bitmap->SetMinSize(tooltip.IsEmpty() ? wxSize(0, 0) : m_manifold_warning_bmp.bmp().GetSize());
 
     m_mirror_bitmap_on.msw_rescale();
     m_mirror_bitmap_off.msw_rescale();
diff --git a/src/slic3r/GUI/GUI_Utils.cpp b/src/slic3r/GUI/GUI_Utils.cpp
index 74e70c5546..d5753f2ccf 100644
--- a/src/slic3r/GUI/GUI_Utils.cpp
+++ b/src/slic3r/GUI/GUI_Utils.cpp
@@ -62,7 +62,7 @@ template<class F> typename F::FN winapi_get_function(const wchar_t *dll, const c
     static HINSTANCE dll_handle = LoadLibraryExW(dll, nullptr, 0);
 
     if (dll_handle == nullptr) { return nullptr; }
-    return (F::FN)GetProcAddress(dll_handle, fn_name);
+    return (typename F::FN)GetProcAddress(dll_handle, fn_name);
 }
 #endif
 
diff --git a/src/slic3r/GUI/GUI_Utils.hpp b/src/slic3r/GUI/GUI_Utils.hpp
index a17bbf6d33..c47714e464 100644
--- a/src/slic3r/GUI/GUI_Utils.hpp
+++ b/src/slic3r/GUI/GUI_Utils.hpp
@@ -64,6 +64,12 @@ public:
         m_prev_scale_factor = m_scale_factor;
 		m_normal_font = get_default_font_for_dpi(dpi);
 
+        /* Because of default window font is a primary display font, 
+         * We should set correct font for window before getting em_unit value.
+         */
+#ifndef __WXOSX__ // Don't call SetFont under OSX to avoid name cutting in ObjectList 
+        this->SetFont(m_normal_font);
+#endif
         // initialize default width_unit according to the width of the one symbol ("m") of the currently active font of this window.
         m_em_unit = std::max<size_t>(10, this->GetTextExtent("m").x - 1);
 
@@ -72,6 +78,8 @@ public:
         this->Bind(EVT_DPI_CHANGED, [this](const DpiChangedEvent &evt) {
             m_scale_factor = (float)evt.dpi / (float)DPI_DEFAULT;
 
+            m_new_font_point_size = get_default_font_for_dpi(evt.dpi).GetPointSize();
+
             if (!m_can_rescale)
                 return;
 
@@ -124,6 +132,8 @@ private:
     float m_prev_scale_factor;
     bool  m_can_rescale{ true };
 
+    int   m_new_font_point_size;
+
 //    void recalc_font()
 //    {
 //        wxClientDC dc(this);
@@ -135,14 +145,22 @@ private:
     // check if new scale is differ from previous
     bool    is_new_scale_factor() const { return fabs(m_scale_factor - m_prev_scale_factor) > 0.001; }
 
+    // function for a font scaling of the window
+    void    scale_win_font(wxWindow *window, const int font_point_size)
+    {
+        wxFont new_font(window->GetFont());
+        new_font.SetPointSize(font_point_size);
+        window->SetFont(new_font);
+    }
+
     // recursive function for scaling fonts for all controls in Window
-    void    scale_controls_fonts(wxWindow *window, const float scale_f)
+    void    scale_controls_fonts(wxWindow *window, const int font_point_size)
     {
         auto children = window->GetChildren();
 
         for (auto child : children) {
-            scale_controls_fonts(child, scale_f);
-            child->SetFont(child->GetFont().Scaled(scale_f));
+            scale_controls_fonts(child, font_point_size);
+            scale_win_font(child, font_point_size);
         }
 
         window->Layout();
@@ -151,18 +169,18 @@ private:
     void    rescale(const wxRect &suggested_rect)
     {
         this->Freeze();
-        const float relative_scale_factor = m_scale_factor / m_prev_scale_factor;
 
         // rescale fonts of all controls
-        scale_controls_fonts(this, relative_scale_factor);
-        this->SetFont(this->GetFont().Scaled(relative_scale_factor));
+        scale_controls_fonts(this, m_new_font_point_size);
+        // rescale current window font
+        scale_win_font(this, m_new_font_point_size);
 
 
-        // rescale normal_font value
-        m_normal_font = m_normal_font.Scaled(relative_scale_factor);
+        // set normal application font as a current window font
+        m_normal_font = this->GetFont();
 
-        // An analog of em_unit value from GUI_App.
-        m_em_unit = std::max<size_t>(10, 10 * m_scale_factor);
+        // update em_unit value for new window font
+        m_em_unit = std::max<size_t>(10, this->GetTextExtent("m").x - 1);
 
         // rescale missed controls sizes and images
         on_dpi_changed(suggested_rect);
diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index b0945aea83..12a38d2fc0 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -39,10 +39,12 @@ DPIFrame(NULL, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_S
 {
     // Fonts were created by the DPIFrame constructor for the monitor, on which the window opened.
     wxGetApp().update_fonts(this);
+/*
 #ifndef __WXOSX__ // Don't call SetFont under OSX to avoid name cutting in ObjectList 
     this->SetFont(this->normal_font());
 #endif
-
+    // Font is already set in DPIFrame constructor
+*/
     // Load the icon either from the exe, or from the ico file.
 #if _WIN32
     {
@@ -729,29 +731,26 @@ void MainFrame::quick_slice(const int qs)
 
     // select input file
     if (!(qs & qsReslice)) {
-        auto dlg = new wxFileDialog(this, _(L("Choose a file to slice (STL/OBJ/AMF/3MF/PRUSA):")),
+        wxFileDialog dlg(this, _(L("Choose a file to slice (STL/OBJ/AMF/3MF/PRUSA):")),
             wxGetApp().app_config->get_last_dir(), "",
             file_wildcards(FT_MODEL), wxFD_OPEN | wxFD_FILE_MUST_EXIST);
-        if (dlg->ShowModal() != wxID_OK) {
-            dlg->Destroy();
+        if (dlg.ShowModal() != wxID_OK)
             return;
-        }
-        input_file = dlg->GetPath();
-        dlg->Destroy();
+        input_file = dlg.GetPath();
         if (!(qs & qsExportSVG))
             m_qs_last_input_file = input_file;
     }
     else {
         if (m_qs_last_input_file.IsEmpty()) {
-            auto dlg = new wxMessageDialog(this, _(L("No previously sliced file.")),
+            wxMessageDialog dlg(this, _(L("No previously sliced file.")),
                 _(L("Error")), wxICON_ERROR | wxOK);
-            dlg->ShowModal();
+            dlg.ShowModal();
             return;
         }
         if (std::ifstream(m_qs_last_input_file.ToUTF8().data())) {
-            auto dlg = new wxMessageDialog(this, _(L("Previously sliced file ("))+m_qs_last_input_file+_(L(") not found.")),
+            wxMessageDialog dlg(this, _(L("Previously sliced file ("))+m_qs_last_input_file+_(L(") not found.")),
                 _(L("File Not Found")), wxICON_ERROR | wxOK);
-            dlg->ShowModal();
+            dlg.ShowModal();
             return;
         }
         input_file = m_qs_last_input_file;
@@ -785,30 +784,24 @@ void MainFrame::quick_slice(const int qs)
     } 
     else if (qs & qsSaveAs) {
         // The following line may die if the output_filename_format template substitution fails.
-        auto dlg = new wxFileDialog(this, wxString::Format(_(L("Save %s file as:")) , qs & qsExportSVG ? _(L("SVG")) : _(L("G-code")) ),
+        wxFileDialog dlg(this, wxString::Format(_(L("Save %s file as:")) , qs & qsExportSVG ? _(L("SVG")) : _(L("G-code")) ),
             wxGetApp().app_config->get_last_output_dir(get_dir_name(output_file)), get_base_name(input_file), 
             qs & qsExportSVG ? file_wildcards(FT_SVG) : file_wildcards(FT_GCODE),
             wxFD_SAVE | wxFD_OVERWRITE_PROMPT);
-        if (dlg->ShowModal() != wxID_OK) {
-            dlg->Destroy();
+        if (dlg.ShowModal() != wxID_OK)
             return;
-        }
-        output_file = dlg->GetPath();
-        dlg->Destroy();
+        output_file = dlg.GetPath();
         if (!(qs & qsExportSVG))
             m_qs_last_output_file = output_file;
         wxGetApp().app_config->update_last_output_dir(get_dir_name(output_file));
     } 
     else if (qs & qsExportPNG) {
-        auto dlg = new wxFileDialog(this, _(L("Save zip file as:")),
+        wxFileDialog dlg(this, _(L("Save zip file as:")),
             wxGetApp().app_config->get_last_output_dir(get_dir_name(output_file)),
             get_base_name(output_file), "*.sl1", wxFD_SAVE | wxFD_OVERWRITE_PROMPT);
-        if (dlg->ShowModal() != wxID_OK) {
-            dlg->Destroy();
+        if (dlg.ShowModal() != wxID_OK)
             return;
-        }
-        output_file = dlg->GetPath();
-        dlg->Destroy();
+        output_file = dlg.GetPath();
     }
 
     // show processbar dialog
@@ -854,28 +847,22 @@ void MainFrame::repair_stl()
 {
     wxString input_file;
     {
-        auto dlg = new wxFileDialog(this, _(L("Select the STL file to repair:")),
+        wxFileDialog dlg(this, _(L("Select the STL file to repair:")),
             wxGetApp().app_config->get_last_dir(), "",
             file_wildcards(FT_STL), wxFD_OPEN | wxFD_FILE_MUST_EXIST);
-        if (dlg->ShowModal() != wxID_OK) {
-            dlg->Destroy();
+        if (dlg.ShowModal() != wxID_OK)
             return;
-        }
-        input_file = dlg->GetPath();
-        dlg->Destroy();
+        input_file = dlg.GetPath();
     }
 
     wxString output_file = input_file;
     {
-        auto dlg = new wxFileDialog( this, L("Save OBJ file (less prone to coordinate errors than STL) as:"), 
+        wxFileDialog dlg( this, L("Save OBJ file (less prone to coordinate errors than STL) as:"),
                                         get_dir_name(output_file), get_base_name(output_file, ".obj"),
                                         file_wildcards(FT_OBJ), wxFD_SAVE | wxFD_OVERWRITE_PROMPT);
-        if (dlg->ShowModal() != wxID_OK) {
-            dlg->Destroy();
+        if (dlg.ShowModal() != wxID_OK)
             return;
-        }
-        output_file = dlg->GetPath();
-        dlg->Destroy();
+        output_file = dlg.GetPath();
     }
 
     auto tmesh = new Slic3r::TriangleMesh();
@@ -896,14 +883,13 @@ void MainFrame::export_config()
         return;
     }
     // Ask user for the file name for the config file.
-    auto dlg = new wxFileDialog(this, _(L("Save configuration as:")),
+    wxFileDialog dlg(this, _(L("Save configuration as:")),
         !m_last_config.IsEmpty() ? get_dir_name(m_last_config) : wxGetApp().app_config->get_last_dir(),
         !m_last_config.IsEmpty() ? get_base_name(m_last_config) : "config.ini",
         file_wildcards(FT_INI), wxFD_SAVE | wxFD_OVERWRITE_PROMPT);
     wxString file;
-    if (dlg->ShowModal() == wxID_OK)
-        file = dlg->GetPath();
-    dlg->Destroy();
+    if (dlg.ShowModal() == wxID_OK)
+        file = dlg.GetPath();
     if (!file.IsEmpty()) {
         wxGetApp().app_config->update_config_dir(get_dir_name(file));
         m_last_config = file;
@@ -916,13 +902,12 @@ void MainFrame::load_config_file()
 {
     if (!wxGetApp().check_unsaved_changes())
         return;
-    auto dlg = new wxFileDialog(this, _(L("Select configuration to load:")),
+    wxFileDialog dlg(this, _(L("Select configuration to load:")),
         !m_last_config.IsEmpty() ? get_dir_name(m_last_config) : wxGetApp().app_config->get_last_dir(),
         "config.ini", "INI files (*.ini, *.gcode)|*.ini;*.INI;*.gcode;*.g", wxFD_OPEN | wxFD_FILE_MUST_EXIST);
 	wxString file;
-	if (dlg->ShowModal() == wxID_OK) 
-		file = dlg->GetPath();
-    dlg->Destroy();
+    if (dlg.ShowModal() == wxID_OK)
+        file = dlg.GetPath();
 	if (! file.IsEmpty() && this->load_config_file(file.ToUTF8().data())) {
         wxGetApp().app_config->update_config_dir(get_dir_name(file));
         m_last_config = file;
@@ -953,14 +938,13 @@ void MainFrame::export_configbundle()
         return;
     }
     // Ask user for a file name.
-    auto dlg = new wxFileDialog(this, _(L("Save presets bundle as:")),
+    wxFileDialog dlg(this, _(L("Save presets bundle as:")),
         !m_last_config.IsEmpty() ? get_dir_name(m_last_config) : wxGetApp().app_config->get_last_dir(),
         SLIC3R_APP_KEY "_config_bundle.ini",
         file_wildcards(FT_INI), wxFD_SAVE | wxFD_OVERWRITE_PROMPT);
     wxString file;
-    if (dlg->ShowModal() == wxID_OK)
-        file = dlg->GetPath();
-    dlg->Destroy();
+    if (dlg.ShowModal() == wxID_OK)
+        file = dlg.GetPath();
     if (!file.IsEmpty()) {
         // Export the config bundle.
         wxGetApp().app_config->update_config_dir(get_dir_name(file));
@@ -980,15 +964,12 @@ void MainFrame::load_configbundle(wxString file/* = wxEmptyString, const bool re
     if (!wxGetApp().check_unsaved_changes())
         return;
     if (file.IsEmpty()) {
-        auto dlg = new wxFileDialog(this, _(L("Select configuration to load:")),
+        wxFileDialog dlg(this, _(L("Select configuration to load:")),
             !m_last_config.IsEmpty() ? get_dir_name(m_last_config) : wxGetApp().app_config->get_last_dir(),
             "config.ini", file_wildcards(FT_INI), wxFD_OPEN | wxFD_FILE_MUST_EXIST);
-		if (dlg->ShowModal() != wxID_OK) {
-			dlg->Destroy();
-			return;
-		}
-        file = dlg->GetPath();
-		dlg->Destroy();
+        if (dlg.ShowModal() != wxID_OK)
+            return;
+        file = dlg.GetPath();
 	}
 
     wxGetApp().app_config->update_config_dir(get_dir_name(file));
diff --git a/src/slic3r/GUI/MainFrame.hpp b/src/slic3r/GUI/MainFrame.hpp
index 5d34be48ef..0e8a053e0f 100644
--- a/src/slic3r/GUI/MainFrame.hpp
+++ b/src/slic3r/GUI/MainFrame.hpp
@@ -1,4 +1,4 @@
-#ifndef slic3r_MainFrame_hpp_
+#ifndef slic3r_MainFrame_hpp_
 #define slic3r_MainFrame_hpp_
 
 #include "libslic3r/PrintConfig.hpp"
diff --git a/src/slic3r/GUI/MsgDialog.hpp b/src/slic3r/GUI/MsgDialog.hpp
index ad4bbcc971..5a49298495 100644
--- a/src/slic3r/GUI/MsgDialog.hpp
+++ b/src/slic3r/GUI/MsgDialog.hpp
@@ -8,8 +8,6 @@
 #include <wx/font.h>
 #include <wx/bitmap.h>
 
-#include "slic3r/Utils/Semver.hpp"
-
 class wxBoxSizer;
 class wxCheckBox;
 class wxStaticBitmap;
diff --git a/src/slic3r/GUI/OptionsGroup.cpp b/src/slic3r/GUI/OptionsGroup.cpp
index 656e07a0e3..656df86ff2 100644
--- a/src/slic3r/GUI/OptionsGroup.cpp
+++ b/src/slic3r/GUI/OptionsGroup.cpp
@@ -1,4 +1,4 @@
-#include "OptionsGroup.hpp"
+#include "OptionsGroup.hpp"
 #include "ConfigExceptions.hpp"
 
 #include <utility>
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 99f63da8a1..476caead14 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -290,17 +290,17 @@ wxBitmapComboBox(parent, wxID_ANY, wxEmptyString, wxDefaultPosition, wxSize(15 *
             auto colors = static_cast<ConfigOptionStrings*>(cfg->option("extruder_colour")->clone());
             wxColour clr(colors->values[extruder_idx]);
             if (!clr.IsOk())
-                clr = wxTransparentColour;
+                clr = wxColour(0,0,0); // Don't set alfa to transparence
 
             auto data = new wxColourData();
             data->SetChooseFull(1);
             data->SetColour(clr);
 
-            auto dialog = new wxColourDialog(this, data);
-            dialog->CenterOnParent();
-            if (dialog->ShowModal() == wxID_OK)
+            wxColourDialog dialog(this, data);
+            dialog.CenterOnParent();
+            if (dialog.ShowModal() == wxID_OK)
             {
-                colors->values[extruder_idx] = dialog->GetColourData().GetColour().GetAsString(wxC2S_HTML_SYNTAX);
+                colors->values[extruder_idx] = dialog.GetColourData().GetColour().GetAsString(wxC2S_HTML_SYNTAX);
 
                 DynamicPrintConfig cfg_new = *cfg;
                 cfg_new.set_key_value("extruder_colour", colors);
@@ -309,7 +309,6 @@ wxBitmapComboBox(parent, wxID_ANY, wxEmptyString, wxDefaultPosition, wxSize(15 *
                 wxGetApp().preset_bundle->update_platter_filament_ui(extruder_idx, this);
                 wxGetApp().plater()->on_config_change(cfg_new);
             }
-            dialog->Destroy();
         });
     }
 
@@ -2511,15 +2510,14 @@ wxString Plater::priv::get_export_file(GUI::FileType file_type)
         default: break;
     }
 
-    wxFileDialog* dlg = new wxFileDialog(q, dlg_title,
+    wxFileDialog dlg(q, dlg_title,
         from_path(output_file.parent_path()), from_path(output_file.filename()),
         wildcard, wxFD_SAVE | wxFD_OVERWRITE_PROMPT);
 
-    if (dlg->ShowModal() != wxID_OK) {
+    if (dlg.ShowModal() != wxID_OK)
         return wxEmptyString;
-    }
 
-    wxString out_path = dlg->GetPath();
+    wxString out_path = dlg.GetPath();
     fs::path path(into_path(out_path));
     wxGetApp().app_config->update_last_output_dir(path.parent_path().string());
 
@@ -4604,6 +4602,30 @@ void Plater::on_config_change(const DynamicPrintConfig &config)
     bool update_scheduled = false;
     bool bed_shape_changed = false;
     for (auto opt_key : p->config->diff(config)) {
+        if (opt_key == "filament_colour")
+        {
+            update_scheduled = true; // update should be scheduled (for update 3DScene) #2738
+
+            /* There is a case, when we use filament_color instead of extruder_color (when extruder_color == "").
+             * Thus plater config option "filament_colour" should be filled with filament_presets values.
+             * Otherwise, on 3dScene will be used last edited filament color for all volumes with extruder_color == "".
+             */
+            const std::vector<std::string> filament_presets = wxGetApp().preset_bundle->filament_presets;
+            if (filament_presets.size() > 1 &&
+                p->config->option<ConfigOptionStrings>(opt_key)->values.size() != config.option<ConfigOptionStrings>(opt_key)->values.size())
+            {
+                const PresetCollection& filaments = wxGetApp().preset_bundle->filaments;
+                std::vector<std::string> filament_colors;
+                filament_colors.reserve(filament_presets.size());
+
+                for (const std::string& filament_preset : filament_presets)
+                    filament_colors.push_back(filaments.find_preset(filament_preset, true)->config.opt_string("filament_colour", (unsigned)0));
+
+                p->config->option<ConfigOptionStrings>(opt_key)->values = filament_colors;
+                continue;
+            }
+        }
+        
         p->config->set_key_value(opt_key, config.option(opt_key)->clone());
         if (opt_key == "printer_technology")
             this->set_printer_technology(config.opt_enum<PrinterTechnology>(opt_key));
diff --git a/src/slic3r/GUI/Preset.cpp b/src/slic3r/GUI/Preset.cpp
index 833da238a5..64793630ca 100644
--- a/src/slic3r/GUI/Preset.cpp
+++ b/src/slic3r/GUI/Preset.cpp
@@ -500,7 +500,8 @@ const std::vector<std::string>& Preset::sla_material_options()
     if (s_opts.empty()) {
         s_opts = {
             "initial_layer_height",
-            "exposure_time", "initial_exposure_time",
+            "exposure_time",
+            "initial_exposure_time",
             "material_correction",
             "material_notes",
             "default_sla_material_profile",
@@ -526,6 +527,8 @@ const std::vector<std::string>& Preset::sla_printer_options()
             "relative_correction",
             "absolute_correction",
             "gamma_correction",
+            "min_exposure_time", "max_exposure_time",
+            "min_initial_exposure_time", "max_initial_exposure_time",
             "print_host", "printhost_apikey", "printhost_cafile",
             "printer_notes",
             "inherits"
diff --git a/src/slic3r/GUI/Preset.hpp b/src/slic3r/GUI/Preset.hpp
index 8fd1652a83..e1efdc1ef0 100644
--- a/src/slic3r/GUI/Preset.hpp
+++ b/src/slic3r/GUI/Preset.hpp
@@ -8,7 +8,7 @@
 
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/PrintConfig.hpp"
-#include "slic3r/Utils/Semver.hpp"
+#include "libslic3r/Semver.hpp"
 
 class wxBitmap;
 class wxBitmapComboBox;
diff --git a/src/slic3r/GUI/PresetBundle.cpp b/src/slic3r/GUI/PresetBundle.cpp
index 7c9f7af4e9..3aee71c4c7 100644
--- a/src/slic3r/GUI/PresetBundle.cpp
+++ b/src/slic3r/GUI/PresetBundle.cpp
@@ -763,8 +763,11 @@ void PresetBundle::load_config_file_config(const std::string &name_or_path, bool
                 }
             }
             // Load the configs into this->filaments and make them active.
-            this->filament_presets.clear();
-            for (size_t i = 0; i < configs.size(); ++ i) {
+            this->filament_presets = std::vector<std::string>(configs.size());
+            // To avoid incorrect selection of the first filament preset (means a value of Preset->m_idx_selected) 
+            // in a case when next added preset take a place of previosly selected preset,
+            // we should add presets from last to first
+            for (int i = (int)configs.size()-1; i >= 0; i--) {
                 DynamicPrintConfig &cfg = configs[i];
                 // Split the "compatible_printers_condition" and "inherits" from the cummulative vectors to separate filament presets.
                 cfg.opt_string("compatible_printers_condition", true) = compatible_printers_condition_values[i + 1];
@@ -789,7 +792,7 @@ void PresetBundle::load_config_file_config(const std::string &name_or_path, bool
                         new_name, std::move(cfg), i == 0);
                     loaded->save();
                 }
-                this->filament_presets.emplace_back(loaded->name);
+                this->filament_presets[i] = loaded->name;
             }
         }
         // 4) Load the project config values (the per extruder wipe matrix etc).
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index ea3ecf14d6..6f8583c098 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -159,8 +159,8 @@ void Tab::create_preset_tab()
     m_undo_to_sys_btn->Bind(wxEVT_BUTTON, ([this](wxCommandEvent) { on_roll_back_value(true); }));
     m_question_btn->Bind(wxEVT_BUTTON, ([this](wxCommandEvent)
     {
-        auto dlg = new ButtonsDescription(this, m_icon_descriptions);
-        if (dlg->ShowModal() == wxID_OK) {
+        ButtonsDescription dlg(this, m_icon_descriptions);
+        if (dlg.ShowModal() == wxID_OK) {
             // Colors for ui "decoration"
             for (Tab *tab : wxGetApp().tabs_list) {
                 tab->m_sys_label_clr = wxGetApp().get_label_clr_sys();
@@ -838,7 +838,7 @@ static wxString support_combo_value_for_config(const DynamicPrintConfig &config,
 
 static wxString pad_combo_value_for_config(const DynamicPrintConfig &config)
 {
-	return config.opt_bool("pad_enable") ? (config.opt_bool("pad_zero_elevation") ? _("Around object") : _("Below object")) : _("None");
+    return config.opt_bool("pad_enable") ? (config.opt_bool("pad_zero_elevation") ? _("Around object") : _("Below object")) : _("None");
 }
 
 void Tab::on_value_change(const std::string& opt_key, const boost::any& value)
@@ -860,8 +860,8 @@ void Tab::on_value_change(const std::string& opt_key, const boost::any& value)
             (opt_key == "supports_enable"  || opt_key == "support_buildplate_only"))
         og_freq_chng_params->set_value("support", support_combo_value_for_config(*m_config, is_fff));
 
-	if (! is_fff && (opt_key == "pad_enable" || opt_key == "pad_zero_elevation"))
-		og_freq_chng_params->set_value("pad", pad_combo_value_for_config(*m_config));
+    if (! is_fff && (opt_key == "pad_enable" || opt_key == "pad_zero_elevation"))
+        og_freq_chng_params->set_value("pad", pad_combo_value_for_config(*m_config));
 
     if (opt_key == "brim_width")
     {
@@ -998,7 +998,7 @@ void Tab::update_frequently_changed_parameters()
 
     og_freq_chng_params->set_value("support", support_combo_value_for_config(*m_config, is_fff));
     if (! is_fff)
-    	og_freq_chng_params->set_value("pad", pad_combo_value_for_config(*m_config));
+        og_freq_chng_params->set_value("pad", pad_combo_value_for_config(*m_config));
 
     const std::string updated_value_key = is_fff ? "fill_density" : "pad_enable";
 
@@ -1266,10 +1266,10 @@ void TabPrint::update()
     if (m_config->opt_float("layer_height") < EPSILON)
     {
         const wxString msg_text = _(L("Zero layer height is not valid.\n\nThe layer height will be reset to 0.01."));
-        auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Layer height")), wxICON_WARNING | wxOK);
+        wxMessageDialog dialog(parent(), msg_text, _(L("Layer height")), wxICON_WARNING | wxOK);
         DynamicPrintConfig new_conf = *m_config;
         is_msg_dlg_already_exist = true;
-        dialog->ShowModal();
+        dialog.ShowModal();
         new_conf.set_key_value("layer_height", new ConfigOptionFloat(0.01));
         load_config(new_conf);
         is_msg_dlg_already_exist = false;
@@ -1278,10 +1278,10 @@ void TabPrint::update()
     if (fabs(m_config->option<ConfigOptionFloatOrPercent>("first_layer_height")->value - 0) < EPSILON)
     {
         const wxString msg_text = _(L("Zero first layer height is not valid.\n\nThe first layer height will be reset to 0.01."));
-        auto dialog = new wxMessageDialog(parent(), msg_text, _(L("First layer height")), wxICON_WARNING | wxOK);
+        wxMessageDialog dialog(parent(), msg_text, _(L("First layer height")), wxICON_WARNING | wxOK);
         DynamicPrintConfig new_conf = *m_config;
         is_msg_dlg_already_exist = true;
-        dialog->ShowModal();
+        dialog.ShowModal();
         new_conf.set_key_value("first_layer_height", new ConfigOptionFloatOrPercent(0.01, false));
         load_config(new_conf);
         is_msg_dlg_already_exist = false;
@@ -1299,9 +1299,9 @@ void TabPrint::update()
             "- no support material\n"
             "- no ensure_vertical_shell_thickness\n"
             "\nShall I adjust those settings in order to enable Spiral Vase?"));
-        auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Spiral Vase")), wxICON_WARNING | wxYES | wxNO);
+        wxMessageDialog dialog(parent(), msg_text, _(L("Spiral Vase")), wxICON_WARNING | wxYES | wxNO);
         DynamicPrintConfig new_conf = *m_config;
-        if (dialog->ShowModal() == wxID_YES) {
+        if (dialog.ShowModal() == wxID_YES) {
             new_conf.set_key_value("perimeters", new ConfigOptionInt(1));
             new_conf.set_key_value("top_solid_layers", new ConfigOptionInt(0));
             new_conf.set_key_value("fill_density", new ConfigOptionPercent(0));
@@ -1324,9 +1324,9 @@ void TabPrint::update()
             "if they are printed with the current extruder without triggering a tool change.\n"
             "(both support_material_extruder and support_material_interface_extruder need to be set to 0).\n"
             "\nShall I adjust those settings in order to enable the Wipe Tower?"));
-        auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Wipe Tower")), wxICON_WARNING | wxYES | wxNO);
+        wxMessageDialog dialog(parent(), msg_text, _(L("Wipe Tower")), wxICON_WARNING | wxYES | wxNO);
         DynamicPrintConfig new_conf = *m_config;
-        if (dialog->ShowModal() == wxID_YES) {
+        if (dialog.ShowModal() == wxID_YES) {
             new_conf.set_key_value("support_material_extruder", new ConfigOptionInt(0));
             new_conf.set_key_value("support_material_interface_extruder", new ConfigOptionInt(0));
         }
@@ -1341,9 +1341,9 @@ void TabPrint::update()
         wxString msg_text = _(L("For the Wipe Tower to work with the soluble supports, the support layers\n"
             "need to be synchronized with the object layers.\n"
             "\nShall I synchronize support layers in order to enable the Wipe Tower?"));
-        auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Wipe Tower")), wxICON_WARNING | wxYES | wxNO);
+        wxMessageDialog dialog(parent(), msg_text, _(L("Wipe Tower")), wxICON_WARNING | wxYES | wxNO);
         DynamicPrintConfig new_conf = *m_config;
-        if (dialog->ShowModal() == wxID_YES) {
+        if (dialog.ShowModal() == wxID_YES) {
             new_conf.set_key_value("support_material_synchronize_layers", new ConfigOptionBool(true));
         }
         else
@@ -1359,9 +1359,9 @@ void TabPrint::update()
                 wxString msg_text = _(L("Supports work better, if the following feature is enabled:\n"
                     "- Detect bridging perimeters\n"
                     "\nShall I adjust those settings for supports?"));
-                auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Support Generator")), wxICON_WARNING | wxYES | wxNO | wxCANCEL);
+                wxMessageDialog dialog(parent(), msg_text, _(L("Support Generator")), wxICON_WARNING | wxYES | wxNO | wxCANCEL);
                 DynamicPrintConfig new_conf = *m_config;
-                auto answer = dialog->ShowModal();
+                auto answer = dialog.ShowModal();
                 if (answer == wxID_YES) {
                     // Enable "detect bridging perimeters".
                     new_conf.set_key_value("overhangs", new ConfigOptionBool(true));
@@ -1403,9 +1403,9 @@ void TabPrint::update()
             if (!correct_100p_fill) {
                 wxString msg_text = GUI::from_u8((boost::format(_utf8(L("The %1% infill pattern is not supposed to work at 100%% density.\n\n"
                                                                "Shall I switch to rectilinear fill pattern?"))) % str_fill_pattern).str());
-                auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Infill")), wxICON_WARNING | wxYES | wxNO);
+                wxMessageDialog dialog(parent(), msg_text, _(L("Infill")), wxICON_WARNING | wxYES | wxNO);
                 DynamicPrintConfig new_conf = *m_config;
-                if (dialog->ShowModal() == wxID_YES) {
+                if (dialog.ShowModal() == wxID_YES) {
                     new_conf.set_key_value("fill_pattern", new ConfigOptionEnum<InfillPattern>(ipRectilinear));
                     fill_density = 100;
                 }
@@ -1772,13 +1772,13 @@ void TabFilament::reload_config()
 
 void TabFilament::update_volumetric_flow_preset_hints()
 {
-	wxString text;
-	try {
-		text = from_u8(PresetHints::maximum_volumetric_flow_description(*m_preset_bundle));
-	} catch (std::exception &ex) {
-		text = _(L("Volumetric flow hints not available\n\n")) + from_u8(ex.what());
-	}
-	m_volumetric_speed_description_line->SetText(text);
+    wxString text;
+    try {
+        text = from_u8(PresetHints::maximum_volumetric_flow_description(*m_preset_bundle));
+    } catch (std::exception &ex) {
+        text = _(L("Volumetric flow hints not available\n\n")) + from_u8(ex.what());
+    }
+    m_volumetric_speed_description_line->SetText(text);
 }
 
 void TabFilament::update()
@@ -1788,9 +1788,9 @@ void TabFilament::update()
 
     m_update_cnt++;
 
-	wxString text = from_u8(PresetHints::cooling_description(m_presets->get_edited_preset()));
-	m_cooling_description_line->SetText(text);
-	this->update_volumetric_flow_preset_hints();
+    wxString text = from_u8(PresetHints::cooling_description(m_presets->get_edited_preset()));
+    m_cooling_description_line->SetText(text);
+    this->update_volumetric_flow_preset_hints();
     Layout();
 
     bool cooling = m_config->opt_bool("cooling", 0);
@@ -1812,8 +1812,8 @@ void TabFilament::update()
 
 void TabFilament::OnActivate()
 {
-	this->update_volumetric_flow_preset_hints();
-	Tab::OnActivate();
+    this->update_volumetric_flow_preset_hints();
+    Tab::OnActivate();
 }
 
 wxSizer* Tab::description_line_widget(wxWindow* parent, ogStaticText* *StaticText)
@@ -2045,10 +2045,10 @@ void TabPrinter::build_fff()
                                     const wxString msg_text = _(L("Single Extruder Multi Material is selected, \n"
                                                                   "and all extruders must have the same diameter.\n"
                                                                   "Do you want to change the diameter for all extruders to first extruder nozzle diameter value?"));
-                                    auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Nozzle diameter")), wxICON_WARNING | wxYES_NO);
+                                    wxMessageDialog dialog(parent(), msg_text, _(L("Nozzle diameter")), wxICON_WARNING | wxYES_NO);
 
                                     DynamicPrintConfig new_conf = *m_config;
-                                    if (dialog->ShowModal() == wxID_YES) {
+                                    if (dialog.ShowModal() == wxID_YES) {
                                         for (size_t i = 1; i < nozzle_diameters.size(); i++)
                                             nozzle_diameters[i] = frst_diam;
 
@@ -2290,6 +2290,12 @@ void TabPrinter::build_sla()
     optgroup->append_single_option_line("absolute_correction");
     optgroup->append_single_option_line("gamma_correction");
 
+    optgroup = page->new_optgroup(_(L("Exposure")));
+    optgroup->append_single_option_line("min_exposure_time");
+    optgroup->append_single_option_line("max_exposure_time");
+    optgroup->append_single_option_line("min_initial_exposure_time");
+    optgroup->append_single_option_line("max_initial_exposure_time");
+
     optgroup = page->new_optgroup(_(L("Print Host upload")));
     build_printhost(optgroup.get());
 
@@ -2507,10 +2513,10 @@ void TabPrinter::build_unregular_pages()
                     {
                         const wxString msg_text = _(L("This is a single extruder multimaterial printer, diameters of all extruders "
                                                       "will be set to the new value. Do you want to proceed?"));
-                        auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Nozzle diameter")), wxICON_WARNING | wxYES_NO);
+                        wxMessageDialog dialog(parent(), msg_text, _(L("Nozzle diameter")), wxICON_WARNING | wxYES_NO);
 
                         DynamicPrintConfig new_conf = *m_config;
-                        if (dialog->ShowModal() == wxID_YES) {
+                        if (dialog.ShowModal() == wxID_YES) {
                             for (size_t i = 0; i < nozzle_diameters.size(); i++) {
                                 if (i==extruder_idx)
                                     continue;
@@ -2558,7 +2564,33 @@ void TabPrinter::build_unregular_pages()
             optgroup->append_single_option_line("retract_restart_extra_toolchange", extruder_idx);
 
             optgroup = page->new_optgroup(_(L("Preview")));
-            optgroup->append_single_option_line("extruder_colour", extruder_idx);
+
+            auto reset_to_filament_color = [this, extruder_idx](wxWindow* parent) {
+                add_scaled_button(parent, &m_reset_to_filament_color, "undo",
+                                  _(L("Reset to Filament Color")), wxBU_LEFT | wxBU_EXACTFIT);
+                ScalableButton* btn = m_reset_to_filament_color;
+                btn->SetFont(Slic3r::GUI::wxGetApp().normal_font());
+                auto sizer = new wxBoxSizer(wxHORIZONTAL);
+                sizer->Add(btn);
+
+                btn->Bind(wxEVT_BUTTON, [this, extruder_idx](wxCommandEvent& e)
+                {
+                    std::vector<std::string> colors = static_cast<const ConfigOptionStrings*>(m_config->option("extruder_colour"))->values;
+                    colors[extruder_idx] = "";
+
+                    DynamicPrintConfig new_conf = *m_config;
+                    new_conf.set_key_value("extruder_colour", new ConfigOptionStrings(colors));
+                    load_config(new_conf);
+
+                    update_dirty();
+                    update();
+                });
+
+                return sizer;
+            };
+            line = optgroup->create_single_option_line("extruder_colour", extruder_idx);
+            line.append_widget(reset_to_filament_color);
+            optgroup->append_line(line);
 
 #ifdef __WXMSW__
         layout_page(page);
@@ -2715,13 +2747,13 @@ void TabPrinter::update_fff()
         get_field("retract_before_wipe", i)->toggle(wipe);
 
         if (use_firmware_retraction && wipe) {
-            auto dialog = new wxMessageDialog(parent(),
+            wxMessageDialog dialog(parent(),
                 _(L("The Wipe option is not available when using the Firmware Retraction mode.\n"
                 "\nShall I disable it in order to enable Firmware Retraction?")),
                 _(L("Firmware Retraction")), wxICON_WARNING | wxYES | wxNO);
 
             DynamicPrintConfig new_conf = *m_config;
-            if (dialog->ShowModal() == wxID_YES) {
+            if (dialog.ShowModal() == wxID_YES) {
                 auto wipe = static_cast<ConfigOptionBools*>(m_config->option("wipe")->clone());
                 for (int w = 0; w < wipe->values.size(); w++)
                     wipe->values[w] = false;
@@ -3073,10 +3105,10 @@ bool Tab::may_discard_current_dirty_preset(PresetCollection* presets /*= nullptr
         message += wxString("\n") + tab + from_u8(new_printer_name) + "\n\n";
         message += _(L("and it has the following unsaved changes:"));
     }
-    auto confirm = new wxMessageDialog(parent(),
+    wxMessageDialog confirm(parent(),
         message + "\n" + changes + "\n\n" + _(L("Discard changes and continue anyway?")),
         _(L("Unsaved Changes")), wxYES_NO | wxNO_DEFAULT | wxICON_QUESTION);
-    return confirm->ShowModal() == wxID_YES;
+    return confirm.ShowModal() == wxID_YES;
 }
 
 // If we are switching from the FFF-preset to the SLA, we should to control the printed objects if they have a part(s).
@@ -3183,11 +3215,11 @@ void Tab::save_preset(std::string name /*= ""*/)
             values.push_back(preset.name);
         }
 
-        auto dlg = new SavePresetWindow(parent());
-        dlg->build(title(), default_name, values);
-        if (dlg->ShowModal() != wxID_OK)
+        SavePresetWindow dlg(parent());
+        dlg.build(title(), default_name, values);
+        if (dlg.ShowModal() != wxID_OK)
             return;
-        name = dlg->get_name();
+        name = dlg.get_name();
         if (name == "") {
             show_error(this, _(L("The supplied name is empty. It can't be saved.")));
             return;
@@ -3799,13 +3831,13 @@ void TabSLAPrint::update()
         wxString msg_text = _(
             L("Head penetration should not be greater than the head width."));
 
-        auto dialog = new wxMessageDialog(parent(),
-                                          msg_text,
-                                          _(L("Invalid Head penetration")),
-                                          wxICON_WARNING | wxOK);
+        wxMessageDialog dialog(parent(),
+                               msg_text,
+                               _(L("Invalid Head penetration")),
+                               wxICON_WARNING | wxOK);
 
         DynamicPrintConfig new_conf = *m_config;
-        if (dialog->ShowModal() == wxID_OK) {
+        if (dialog.ShowModal() == wxID_OK) {
             new_conf.set_key_value("support_head_penetration",
                                    new ConfigOptionFloat(head_width));
         }
@@ -3819,13 +3851,13 @@ void TabSLAPrint::update()
         wxString msg_text = _(L(
             "Pinhead diameter should be smaller than the pillar diameter."));
 
-        auto dialog = new wxMessageDialog(parent(),
-                                          msg_text,
-                                          _(L("Invalid pinhead diameter")),
-                                          wxICON_WARNING | wxOK);
+        wxMessageDialog dialog (parent(),
+                                msg_text,
+                                _(L("Invalid pinhead diameter")),
+                                wxICON_WARNING | wxOK);
 
         DynamicPrintConfig new_conf = *m_config;
-        if (dialog->ShowModal() == wxID_OK) {
+        if (dialog.ShowModal() == wxID_OK) {
             new_conf.set_key_value("support_head_front_diameter",
                                    new ConfigOptionFloat(pillar_d / 2.0));
         }
diff --git a/src/slic3r/GUI/Tab.hpp b/src/slic3r/GUI/Tab.hpp
index e5bba9bd65..bd6ee48254 100644
--- a/src/slic3r/GUI/Tab.hpp
+++ b/src/slic3r/GUI/Tab.hpp
@@ -371,6 +371,7 @@ public:
 	wxButton*	m_serial_test_btn = nullptr;
 	ScalableButton*	m_print_host_test_btn = nullptr;
 	ScalableButton*	m_printhost_browse_btn = nullptr;
+	ScalableButton*	m_reset_to_filament_color = nullptr;
 
 	size_t		m_extruders_count;
 	size_t		m_extruders_count_old = 0;
diff --git a/src/slic3r/GUI/UpdateDialogs.hpp b/src/slic3r/GUI/UpdateDialogs.hpp
index 2a580e2513..4b61b84c23 100644
--- a/src/slic3r/GUI/UpdateDialogs.hpp
+++ b/src/slic3r/GUI/UpdateDialogs.hpp
@@ -5,7 +5,7 @@
 #include <unordered_map>
 #include <vector>
 
-#include "slic3r/Utils/Semver.hpp"
+#include "libslic3r/Semver.hpp"
 #include "MsgDialog.hpp"
 
 class wxBoxSizer;
diff --git a/src/slic3r/GUI/wxExtensions.hpp b/src/slic3r/GUI/wxExtensions.hpp
index 24a28ecff1..14ceab8ff3 100644
--- a/src/slic3r/GUI/wxExtensions.hpp
+++ b/src/slic3r/GUI/wxExtensions.hpp
@@ -11,13 +11,14 @@
 #include <wx/sizer.h>
 #include <wx/slider.h>
 #include <wx/menu.h>
+#include <wx/wx.h>
 
 #include <vector>
 #include <set>
 #include <functional>
 
 namespace Slic3r {
-	enum class ModelVolumeType : int;
+    enum class ModelVolumeType : int;
 };
 
 typedef double                          coordf_t;
@@ -36,11 +37,11 @@ wxMenuItem* append_menu_item(wxMenu* menu, int id, const wxString& string, const
     std::function<void(wxCommandEvent& event)> cb, const std::string& icon = "", wxEvtHandler* event_handler = nullptr,
     std::function<bool()> const cb_condition = []() { return true; }, wxWindow* parent = nullptr);
 
-wxMenuItem* append_submenu(wxMenu* menu, wxMenu* sub_menu, int id, const wxString& string, const wxString& description, 
+wxMenuItem* append_submenu(wxMenu* menu, wxMenu* sub_menu, int id, const wxString& string, const wxString& description,
     const std::string& icon = "",
     std::function<bool()> const cb_condition = []() { return true; }, wxWindow* parent = nullptr);
 
-wxMenuItem* append_menu_radio_item(wxMenu* menu, int id, const wxString& string, const wxString& description, 
+wxMenuItem* append_menu_radio_item(wxMenu* menu, int id, const wxString& string, const wxString& description,
     std::function<void(wxCommandEvent& event)> cb, wxEvtHandler* event_handler);
 
 wxMenuItem* append_menu_check_item(wxMenu* menu, int id, const wxString& string, const wxString& description,
@@ -51,7 +52,7 @@ void    edit_tooltip(wxString& tooltip);
 void    msw_buttons_rescale(wxDialog* dlg, const int em_unit, const std::vector<int>& btn_ids);
 int     em_unit(wxWindow* win);
 
-wxBitmap create_scaled_bitmap(wxWindow *win, const std::string& bmp_name, 
+wxBitmap create_scaled_bitmap(wxWindow *win, const std::string& bmp_name,
     const int px_cnt = 16, const bool is_horizontal = false, const bool grayscale = false);
 
 class wxCheckListBoxComboPopup : public wxCheckListBox, public wxComboPopup
@@ -95,23 +96,23 @@ public:
 
 class wxDataViewTreeCtrlComboPopup: public wxDataViewTreeCtrl, public wxComboPopup
 {
-	static const unsigned int DefaultWidth;
-	static const unsigned int DefaultHeight;
-	static const unsigned int DefaultItemHeight;
+    static const unsigned int DefaultWidth;
+    static const unsigned int DefaultHeight;
+    static const unsigned int DefaultItemHeight;
 
-	wxString	m_text;
-	int			m_cnt_open_items{0};
+    wxString	m_text;
+    int			m_cnt_open_items{0};
 
 public:
-	virtual bool		Create(wxWindow* parent);
-	virtual wxWindow*	GetControl() { return this; }
-	virtual void		SetStringValue(const wxString& value) { m_text = value; }
-	virtual wxString	GetStringValue() const { return m_text; }
+    virtual bool		Create(wxWindow* parent);
+    virtual wxWindow*	GetControl() { return this; }
+    virtual void		SetStringValue(const wxString& value) { m_text = value; }
+    virtual wxString	GetStringValue() const { return m_text; }
 //	virtual wxSize		GetAdjustedSize(int minWidth, int prefHeight, int maxHeight);
 
-	virtual void		OnKeyEvent(wxKeyEvent& evt);
-	void				OnDataViewTreeCtrlSelection(wxCommandEvent& evt);
-	void				SetItemsCnt(int cnt) { m_cnt_open_items = cnt; }
+    virtual void		OnKeyEvent(wxKeyEvent& evt);
+    void				OnDataViewTreeCtrlSelection(wxCommandEvent& evt);
+    void				SetItemsCnt(int cnt) { m_cnt_open_items = cnt; }
 };
 
 
@@ -124,7 +125,7 @@ class DataViewBitmapText : public wxObject
 public:
     DataViewBitmapText( const wxString &text = wxEmptyString,
                         const wxBitmap& bmp = wxNullBitmap) :
-        m_text(text), 
+        m_text(text),
         m_bmp(bmp)
     { }
 
@@ -195,8 +196,8 @@ WX_DEFINE_ARRAY_PTR(ObjectDataViewModelNode*, MyObjectTreeModelNodePtrArray);
 
 class ObjectDataViewModelNode
 {
-	ObjectDataViewModelNode*	    m_parent;
-	MyObjectTreeModelNodePtrArray   m_children;
+    ObjectDataViewModelNode*	    m_parent;
+    MyObjectTreeModelNodePtrArray   m_children;
     wxBitmap                        m_empty_bmp;
     size_t                          m_volumes_cnt = 0;
     std::vector< std::string >      m_opt_categories;
@@ -216,7 +217,7 @@ class ObjectDataViewModelNode
     Slic3r::ModelVolumeType         m_volume_type;
 
 public:
-    ObjectDataViewModelNode(const wxString &name, 
+    ObjectDataViewModelNode(const wxString &name,
                             const wxString& extruder):
         m_parent(NULL),
         m_name(name),
@@ -227,14 +228,14 @@ public:
         init_container();
 	}
 
-	ObjectDataViewModelNode(ObjectDataViewModelNode* parent,
-							const wxString& sub_obj_name, 
-							const wxBitmap& bmp, 
-                            const wxString& extruder, 
+    ObjectDataViewModelNode(ObjectDataViewModelNode* parent,
+                            const wxString& sub_obj_name,
+                            const wxBitmap& bmp,
+                            const wxString& extruder,
                             const int idx = -1 ) :
         m_parent	(parent),
-		m_name		(sub_obj_name),
-		m_type		(itVolume),
+        m_name		(sub_obj_name),
+        m_type		(itVolume),
         m_idx       (idx),
         m_extruder  (extruder)
     {
@@ -243,27 +244,27 @@ public:
         init_container();
     }
 
-	ObjectDataViewModelNode(ObjectDataViewModelNode* parent,
-							const t_layer_height_range& layer_range,
+    ObjectDataViewModelNode(ObjectDataViewModelNode* parent,
+                            const t_layer_height_range& layer_range,
                             const int idx = -1,
                             const wxString& extruder = wxEmptyString );
 
     ObjectDataViewModelNode(ObjectDataViewModelNode* parent, const ItemType type);
 
-	~ObjectDataViewModelNode()
-	{
-		// free all our children nodes
-		size_t count = m_children.GetCount();
-		for (size_t i = 0; i < count; i++)
-		{
-			ObjectDataViewModelNode *child = m_children[i];
-			delete child;
-		}
+    ~ObjectDataViewModelNode()
+    {
+        // free all our children nodes
+        size_t count = m_children.GetCount();
+        for (size_t i = 0; i < count; i++)
+        {
+            ObjectDataViewModelNode *child = m_children[i];
+            delete child;
+        }
 #ifndef NDEBUG
-		// Indicate that the object was deleted.
-		m_idx = -2;
+        // Indicate that the object was deleted.
+        m_idx = -2;
 #endif /* NDEBUG */
-	}
+    }
 
 	void init_container();
 	bool IsContainer() const
@@ -271,53 +272,53 @@ public:
 		return m_container;
 	}
 
-	ObjectDataViewModelNode* GetParent()
-	{
-		assert(m_parent == nullptr || m_parent->valid());
-		return m_parent;
-	}
-	MyObjectTreeModelNodePtrArray& GetChildren()
-	{
-		return m_children;
-	}
-	ObjectDataViewModelNode* GetNthChild(unsigned int n)
-	{
-		return m_children.Item(n);
-	}
-	void Insert(ObjectDataViewModelNode* child, unsigned int n)
-	{
-		if (!m_container)
-			m_container = true;
-		m_children.Insert(child, n);
-	}
-	void Append(ObjectDataViewModelNode* child)
-	{
-		if (!m_container)
-			m_container = true;
-		m_children.Add(child);
-	}
-	void RemoveAllChildren()
-	{
-		if (GetChildCount() == 0)
-			return;
-		for (int id = int(GetChildCount()) - 1; id >= 0; --id)
-		{
-			if (m_children.Item(id)->GetChildCount() > 0)
-				m_children[id]->RemoveAllChildren();
-			auto node = m_children[id];
-			m_children.RemoveAt(id);
-			delete node;
-		}
-	}
+    ObjectDataViewModelNode* GetParent()
+    {
+        assert(m_parent == nullptr || m_parent->valid());
+        return m_parent;
+    }
+    MyObjectTreeModelNodePtrArray& GetChildren()
+    {
+        return m_children;
+    }
+    ObjectDataViewModelNode* GetNthChild(unsigned int n)
+    {
+        return m_children.Item(n);
+    }
+    void Insert(ObjectDataViewModelNode* child, unsigned int n)
+    {
+        if (!m_container)
+            m_container = true;
+        m_children.Insert(child, n);
+    }
+    void Append(ObjectDataViewModelNode* child)
+    {
+        if (!m_container)
+            m_container = true;
+        m_children.Add(child);
+    }
+    void RemoveAllChildren()
+    {
+        if (GetChildCount() == 0)
+            return;
+        for (int id = int(GetChildCount()) - 1; id >= 0; --id)
+        {
+            if (m_children.Item(id)->GetChildCount() > 0)
+                m_children[id]->RemoveAllChildren();
+            auto node = m_children[id];
+            m_children.RemoveAt(id);
+            delete node;
+        }
+    }
 
-	size_t GetChildCount() const
-	{
-		return m_children.GetCount();
-	}
+    size_t GetChildCount() const
+    {
+        return m_children.GetCount();
+    }
 
-	bool            SetValue(const wxVariant &variant, unsigned int col);
+    bool            SetValue(const wxVariant &variant, unsigned int col);
 
-	void            SetBitmap(const wxBitmap &icon) { m_bmp = icon; }
+    void            SetBitmap(const wxBitmap &icon) { m_bmp = icon; }
     const wxBitmap& GetBitmap() const               { return m_bmp; }
     const wxString& GetName() const                 { return m_name; }
     ItemType        GetType() const                 { return m_type; }
@@ -326,46 +327,46 @@ public:
 	t_layer_height_range    GetLayerRange() const   { return m_layer_range; }
     PrintIndicator  IsPrintable() const             { return m_printable; }
 
-	// use this function only for childrens
-	void AssignAllVal(ObjectDataViewModelNode& from_node)
-	{
-		// ! Don't overwrite other values because of equality of this values for all children --
-		m_name = from_node.m_name;
+    // use this function only for childrens
+    void AssignAllVal(ObjectDataViewModelNode& from_node)
+    {
+        // ! Don't overwrite other values because of equality of this values for all children --
+        m_name = from_node.m_name;
         m_bmp = from_node.m_bmp;
         m_idx = from_node.m_idx;
         m_extruder = from_node.m_extruder;
         m_type = from_node.m_type;
-	}
+    }
 
-	bool SwapChildrens(int frst_id, int scnd_id) {
-		if (GetChildCount() < 2 ||
-			frst_id < 0 || (size_t)frst_id >= GetChildCount() ||
-			scnd_id < 0 || (size_t)scnd_id >= GetChildCount())
-			return false;
+    bool SwapChildrens(int frst_id, int scnd_id) {
+        if (GetChildCount() < 2 ||
+            frst_id < 0 || (size_t)frst_id >= GetChildCount() ||
+            scnd_id < 0 || (size_t)scnd_id >= GetChildCount())
+            return false;
 
-		ObjectDataViewModelNode new_scnd = *GetNthChild(frst_id);
-		ObjectDataViewModelNode new_frst = *GetNthChild(scnd_id);
+        ObjectDataViewModelNode new_scnd = *GetNthChild(frst_id);
+        ObjectDataViewModelNode new_frst = *GetNthChild(scnd_id);
 
         new_scnd.m_idx = m_children.Item(scnd_id)->m_idx;
         new_frst.m_idx = m_children.Item(frst_id)->m_idx;
 
-		m_children.Item(frst_id)->AssignAllVal(new_frst);
-		m_children.Item(scnd_id)->AssignAllVal(new_scnd);
-		return true;
-	}
+        m_children.Item(frst_id)->AssignAllVal(new_frst);
+        m_children.Item(scnd_id)->AssignAllVal(new_scnd);
+        return true;
+    }
 
-	// Set action icons for node
+    // Set action icons for node
     void        set_action_icon();
 	// Set printable icon for node
     void        set_printable_icon(PrintIndicator printable);
 
     void        update_settings_digest_bitmaps();
-	bool        update_settings_digest(const std::vector<std::string>& categories);
+    bool        update_settings_digest(const std::vector<std::string>& categories);
     int         volume_type() const { return int(m_volume_type); }
     void        msw_rescale();
 
 #ifndef NDEBUG
-	bool 		valid();
+    bool 		valid();
 #endif /* NDEBUG */
     bool        invalid() const { return m_idx < -1; }
 
@@ -382,7 +383,7 @@ wxDECLARE_EVENT(wxCUSTOMEVT_LAST_VOLUME_IS_DELETED, wxCommandEvent);
 
 class ObjectDataViewModel :public wxDataViewModel
 {
-	std::vector<ObjectDataViewModelNode*>       m_objects;
+    std::vector<ObjectDataViewModelNode*>       m_objects;
     std::vector<wxBitmap*>                      m_volume_bmps;
     wxBitmap*                                   m_warning_bmp;
 
@@ -392,7 +393,7 @@ public:
     ObjectDataViewModel();
     ~ObjectDataViewModel();
 
-	wxDataViewItem Add( const wxString &name, 
+    wxDataViewItem Add( const wxString &name,
                         const int extruder,
                         const bool has_errors = false);
     wxDataViewItem AddVolumeChild(  const wxDataViewItem &parent_item,
@@ -405,24 +406,24 @@ public:
     wxDataViewItem AddInstanceChild(const wxDataViewItem &parent_item, size_t num);
     wxDataViewItem AddInstanceChild(const wxDataViewItem &parent_item, const std::vector<bool>& print_indicator);
     wxDataViewItem AddLayersRoot(const wxDataViewItem &parent_item);
-    wxDataViewItem AddLayersChild(  const wxDataViewItem &parent_item, 
+    wxDataViewItem AddLayersChild(  const wxDataViewItem &parent_item,
                                     const t_layer_height_range& layer_range,
-                                    const int extruder = 0, 
+                                    const int extruder = 0,
                                     const int index = -1);
-	wxDataViewItem Delete(const wxDataViewItem &item);
-	wxDataViewItem DeleteLastInstance(const wxDataViewItem &parent_item, size_t num);
-	void DeleteAll();
+    wxDataViewItem Delete(const wxDataViewItem &item);
+    wxDataViewItem DeleteLastInstance(const wxDataViewItem &parent_item, size_t num);
+    void DeleteAll();
     void DeleteChildren(wxDataViewItem& parent);
     void DeleteVolumeChildren(wxDataViewItem& parent);
     void DeleteSettings(const wxDataViewItem& parent);
-	wxDataViewItem GetItemById(int obj_idx);
+    wxDataViewItem GetItemById(int obj_idx);
     wxDataViewItem GetItemById(const int obj_idx, const int sub_obj_idx, const ItemType parent_type);
-	wxDataViewItem GetItemByVolumeId(int obj_idx, int volume_idx);
-	wxDataViewItem GetItemByInstanceId(int obj_idx, int inst_idx);
+    wxDataViewItem GetItemByVolumeId(int obj_idx, int volume_idx);
+    wxDataViewItem GetItemByInstanceId(int obj_idx, int inst_idx);
     wxDataViewItem GetItemByLayerId(int obj_idx, int layer_idx);
     wxDataViewItem GetItemByLayerRange(const int obj_idx, const t_layer_height_range& layer_range);
     int  GetItemIdByLayerRange(const int obj_idx, const t_layer_height_range& layer_range);
-	int  GetIdByItem(const wxDataViewItem& item) const;
+    int  GetIdByItem(const wxDataViewItem& item) const;
     int  GetIdByItemAndType(const wxDataViewItem& item, const ItemType type) const;
     int  GetObjectIdByItem(const wxDataViewItem& item) const;
     int  GetVolumeIdByItem(const wxDataViewItem& item) const;
@@ -433,53 +434,53 @@ public:
     bool IsEmpty() { return m_objects.empty(); }
     bool InvalidItem(const wxDataViewItem& item);
 
-	// helper method for wxLog
+    // helper method for wxLog
 
-	wxString    GetName(const wxDataViewItem &item) const;
+    wxString    GetName(const wxDataViewItem &item) const;
     wxBitmap&   GetBitmap(const wxDataViewItem &item) const;
 
-	// helper methods to change the model
+    // helper methods to change the model
 
-	virtual unsigned int    GetColumnCount() const override { return 3;}
-	virtual wxString        GetColumnType(unsigned int col) const override{ return wxT("string"); }
+    virtual unsigned int    GetColumnCount() const override { return 3;}
+    virtual wxString        GetColumnType(unsigned int col) const override{ return wxT("string"); }
 
-	virtual void GetValue(  wxVariant &variant,
-		                    const wxDataViewItem &item, 
+    virtual void GetValue(  wxVariant &variant,
+                            const wxDataViewItem &item,
                             unsigned int col) const override;
-	virtual bool SetValue(  const wxVariant &variant,
-		                    const wxDataViewItem &item, 
+    virtual bool SetValue(  const wxVariant &variant,
+                            const wxDataViewItem &item,
                             unsigned int col) override;
-	bool SetValue(  const wxVariant &variant, 
-                    const int item_idx, 
+    bool SetValue(  const wxVariant &variant,
+                    const int item_idx,
                     unsigned int col);
 
-    // For parent move child from cur_volume_id place to new_volume_id 
+    // For parent move child from cur_volume_id place to new_volume_id
     // Remaining items will moved up/down accordingly
-    wxDataViewItem  ReorganizeChildren( const int cur_volume_id, 
+    wxDataViewItem  ReorganizeChildren( const int cur_volume_id,
                                         const int new_volume_id,
                                         const wxDataViewItem &parent);
 
-	virtual bool    IsEnabled(const wxDataViewItem &item, unsigned int col) const override;
+    virtual bool    IsEnabled(const wxDataViewItem &item, unsigned int col) const override;
 
-	virtual wxDataViewItem  GetParent(const wxDataViewItem &item) const override;
+    virtual wxDataViewItem  GetParent(const wxDataViewItem &item) const override;
     // get object item
     wxDataViewItem          GetTopParent(const wxDataViewItem &item) const;
-	virtual bool            IsContainer(const wxDataViewItem &item) const override;
-	virtual unsigned int    GetChildren(const wxDataViewItem &parent,
-		                                wxDataViewItemArray &array) const override;
+    virtual bool            IsContainer(const wxDataViewItem &item) const override;
+    virtual unsigned int    GetChildren(const wxDataViewItem &parent,
+                                        wxDataViewItemArray &array) const override;
     void GetAllChildren(const wxDataViewItem &parent,wxDataViewItemArray &array) const;
-	// Is the container just a header or an item with all columns
-	// In our case it is an item with all columns 
-	virtual bool    HasContainerColumns(const wxDataViewItem& WXUNUSED(item)) const override {	return true; }
+    // Is the container just a header or an item with all columns
+    // In our case it is an item with all columns
+    virtual bool    HasContainerColumns(const wxDataViewItem& WXUNUSED(item)) const override {	return true; }
 
     ItemType        GetItemType(const wxDataViewItem &item) const ;
-    wxDataViewItem  GetItemByType(  const wxDataViewItem &parent_item, 
+    wxDataViewItem  GetItemByType(  const wxDataViewItem &parent_item,
                                     ItemType type) const;
     wxDataViewItem  GetSettingsItem(const wxDataViewItem &item) const;
     wxDataViewItem  GetInstanceRootItem(const wxDataViewItem &item) const;
     wxDataViewItem  GetLayerRootItem(const wxDataViewItem &item) const;
     bool    IsSettingsItem(const wxDataViewItem &item) const;
-    void    UpdateSettingsDigest(   const wxDataViewItem &item, 
+    void    UpdateSettingsDigest(   const wxDataViewItem &item,
                                     const std::vector<std::string>& categories);
 
     bool    IsPrintable(const wxDataViewItem &item) const;
@@ -498,7 +499,7 @@ public:
     // Rescale bitmaps for existing Items
     void    Rescale();
 
-    wxBitmap    GetVolumeIcon(const Slic3r::ModelVolumeType vol_type, 
+    wxBitmap    GetVolumeIcon(const Slic3r::ModelVolumeType vol_type,
                               const bool is_marked = false);
     void        DeleteWarningIcon(const wxDataViewItem& item, const bool unmark_object = false);
     t_layer_height_range    GetLayerRangeByItem(const wxDataViewItem& item) const;
@@ -547,12 +548,12 @@ public:
         return false;
 #else
         return true;
-#endif        
+#endif
     }
-    wxWindow*   CreateEditorCtrl(wxWindow* parent, 
-                                 wxRect labelRect, 
+    wxWindow*   CreateEditorCtrl(wxWindow* parent,
+                                 wxRect labelRect,
                                  const wxVariant& value) override;
-    bool        GetValueFromEditorCtrl( wxWindow* ctrl, 
+    bool        GetValueFromEditorCtrl( wxWindow* ctrl,
                                         wxVariant& value) override;
     bool        WasCanceled() const { return m_was_unusable_symbol; }
 
@@ -569,88 +570,88 @@ private:
 class MyCustomRenderer : public wxDataViewCustomRenderer
 {
 public:
-	// This renderer can be either activatable or editable, for demonstration
-	// purposes. In real programs, you should select whether the user should be
-	// able to activate or edit the cell and it doesn't make sense to switch
-	// between the two -- but this is just an example, so it doesn't stop us.
-	explicit MyCustomRenderer(wxDataViewCellMode mode)
-		: wxDataViewCustomRenderer("string", mode, wxALIGN_CENTER)
-	{ }
+    // This renderer can be either activatable or editable, for demonstration
+    // purposes. In real programs, you should select whether the user should be
+    // able to activate or edit the cell and it doesn't make sense to switch
+    // between the two -- but this is just an example, so it doesn't stop us.
+    explicit MyCustomRenderer(wxDataViewCellMode mode)
+        : wxDataViewCustomRenderer("string", mode, wxALIGN_CENTER)
+    { }
 
-	virtual bool Render(wxRect rect, wxDC *dc, int state) override/*wxOVERRIDE*/
-	{
-		dc->SetBrush(*wxLIGHT_GREY_BRUSH);
-		dc->SetPen(*wxTRANSPARENT_PEN);
+    virtual bool Render(wxRect rect, wxDC *dc, int state) override/*wxOVERRIDE*/
+    {
+        dc->SetBrush(*wxLIGHT_GREY_BRUSH);
+        dc->SetPen(*wxTRANSPARENT_PEN);
 
-		rect.Deflate(2);
-		dc->DrawRoundedRectangle(rect, 5);
+        rect.Deflate(2);
+        dc->DrawRoundedRectangle(rect, 5);
 
-		RenderText(m_value,
-			0, // no offset
-			wxRect(dc->GetTextExtent(m_value)).CentreIn(rect),
-			dc,
-			state);
-		return true;
-	}
+        RenderText(m_value,
+            0, // no offset
+            wxRect(dc->GetTextExtent(m_value)).CentreIn(rect),
+            dc,
+            state);
+        return true;
+    }
 
-		virtual bool ActivateCell(const wxRect& WXUNUSED(cell),
-		wxDataViewModel *WXUNUSED(model),
-		const wxDataViewItem &WXUNUSED(item),
-		unsigned int WXUNUSED(col),
-		const wxMouseEvent *mouseEvent) override/*wxOVERRIDE*/
-	{
-		wxString position;
-		if (mouseEvent)
-			position = wxString::Format("via mouse at %d, %d", mouseEvent->m_x, mouseEvent->m_y);
-		else
-			position = "from keyboard";
+        virtual bool ActivateCell(const wxRect& WXUNUSED(cell),
+        wxDataViewModel *WXUNUSED(model),
+        const wxDataViewItem &WXUNUSED(item),
+        unsigned int WXUNUSED(col),
+        const wxMouseEvent *mouseEvent) override/*wxOVERRIDE*/
+    {
+        wxString position;
+        if (mouseEvent)
+            position = wxString::Format("via mouse at %d, %d", mouseEvent->m_x, mouseEvent->m_y);
+        else
+            position = "from keyboard";
 //		wxLogMessage("MyCustomRenderer ActivateCell() %s", position);
-		return false;
-	}
+        return false;
+    }
 
-		virtual wxSize GetSize() const override/*wxOVERRIDE*/
-	{
-		return wxSize(60, 20);
-	}
+        virtual wxSize GetSize() const override/*wxOVERRIDE*/
+    {
+        return wxSize(60, 20);
+    }
 
-		virtual bool SetValue(const wxVariant &value) override/*wxOVERRIDE*/
-	{
-		m_value = value.GetString();
-		return true;
-	}
+        virtual bool SetValue(const wxVariant &value) override/*wxOVERRIDE*/
+    {
+        m_value = value.GetString();
+        return true;
+    }
 
-		virtual bool GetValue(wxVariant &WXUNUSED(value)) const override/*wxOVERRIDE*/{ return true; }
+        virtual bool GetValue(wxVariant &WXUNUSED(value)) const override/*wxOVERRIDE*/{ return true; }
 
-		virtual bool HasEditorCtrl() const override/*wxOVERRIDE*/{ return true; }
+        virtual bool HasEditorCtrl() const override/*wxOVERRIDE*/{ return true; }
 
-		virtual wxWindow*
-		CreateEditorCtrl(wxWindow* parent,
-		wxRect labelRect,
-		const wxVariant& value) override/*wxOVERRIDE*/
-	{
-		wxTextCtrl* text = new wxTextCtrl(parent, wxID_ANY, value,
-		labelRect.GetPosition(),
-		labelRect.GetSize(),
-		wxTE_PROCESS_ENTER);
-		text->SetInsertionPointEnd();
+        virtual wxWindow*
+        CreateEditorCtrl(wxWindow* parent,
+        wxRect labelRect,
+        const wxVariant& value) override/*wxOVERRIDE*/
+    {
+        wxTextCtrl* text = new wxTextCtrl(parent, wxID_ANY, value,
+        labelRect.GetPosition(),
+        labelRect.GetSize(),
+        wxTE_PROCESS_ENTER);
+        text->SetInsertionPointEnd();
 
-		return text;
-	}
+        return text;
+    }
 
-		virtual bool
-			GetValueFromEditorCtrl(wxWindow* ctrl, wxVariant& value) override/*wxOVERRIDE*/
-	{
-		wxTextCtrl* text = wxDynamicCast(ctrl, wxTextCtrl);
-		if (!text)
-			return false;
+        virtual bool
+            GetValueFromEditorCtrl(wxWindow* ctrl, wxVariant& value) override/*wxOVERRIDE*/
+    {
+        wxTextCtrl* text = wxDynamicCast(ctrl, wxTextCtrl);
+        if (!text)
+            return false;
 
-		value = text->GetValue();
+        value = text->GetValue();
 
-		return true;
-	}
+        return true;
+    }
 
 private:
-	wxString m_value;
+    wxString m_value;
 };
 
 
@@ -662,7 +663,7 @@ class ScalableBitmap
 {
 public:
     ScalableBitmap() {};
-    ScalableBitmap( wxWindow *parent, 
+    ScalableBitmap( wxWindow *parent,
                     const std::string& icon_name = "",
                     const int px_cnt = 16,
                     const bool is_horizontal = false);
@@ -708,9 +709,9 @@ public:
     DoubleSlider(
         wxWindow *parent,
         wxWindowID id,
-        int lowerValue, 
-        int higherValue, 
-        int minValue, 
+        int lowerValue,
+        int higherValue,
+        int minValue,
         int maxValue,
         const wxPoint& pos = wxDefaultPosition,
         const wxSize& size = wxDefaultSize,
@@ -753,8 +754,8 @@ public:
         EnableTickManipulation(false);
     }
 
-	bool is_horizontal() const { return m_style == wxSL_HORIZONTAL; }
-	bool is_one_layer() const { return m_is_one_layer; }
+    bool is_horizontal() const { return m_style == wxSL_HORIZONTAL; }
+    bool is_one_layer() const { return m_is_one_layer; }
     bool is_lower_at_min() const { return m_lower_value == m_min_value; }
     bool is_higher_at_max() const { return m_higher_value == m_max_value; }
     bool is_full_span() const { return this->is_lower_at_min() && this->is_higher_at_max(); }
@@ -773,7 +774,7 @@ public:
     void OnRightUp(wxMouseEvent& event);
 
 protected:
- 
+
     void    render();
     void    draw_focus_rect();
     void    draw_action_icon(wxDC& dc, const wxPoint pt_beg, const wxPoint pt_end);
diff --git a/src/slic3r/Utils/Http.cpp b/src/slic3r/Utils/Http.cpp
index 79c4ecfa91..69301547c3 100644
--- a/src/slic3r/Utils/Http.cpp
+++ b/src/slic3r/Utils/Http.cpp
@@ -5,6 +5,7 @@
 #include <thread>
 #include <deque>
 #include <sstream>
+#include <exception>
 #include <boost/filesystem/fstream.hpp>
 #include <boost/format.hpp>
 
@@ -165,7 +166,7 @@ size_t Http::priv::form_file_read_cb(char *buffer, size_t size, size_t nitems, v
 
 	try {
 		stream->read(buffer, size * nitems);
-	} catch (...) {
+	} catch (const std::exception &) {
 		return CURL_READFUNC_ABORT;
 	}
 
diff --git a/src/slic3r/Utils/OctoPrint.cpp b/src/slic3r/Utils/OctoPrint.cpp
index cafa69c554..09ca02071a 100644
--- a/src/slic3r/Utils/OctoPrint.cpp
+++ b/src/slic3r/Utils/OctoPrint.cpp
@@ -2,6 +2,7 @@
 
 #include <algorithm>
 #include <sstream>
+#include <exception>
 #include <boost/format.hpp>
 #include <boost/log/trivial.hpp>
 #include <boost/property_tree/ptree.hpp>
@@ -69,7 +70,7 @@ bool OctoPrint::test(wxString &msg) const
                     msg = wxString::Format(_(L("Mismatched type of print host: %s")), text ? *text : "OctoPrint");
                 }
             }
-            catch (...) {
+            catch (const std::exception &) {
                 res = false;
                 msg = "Could not parse server response";
             }
diff --git a/src/slic3r/Utils/PresetUpdater.cpp b/src/slic3r/Utils/PresetUpdater.cpp
index bc600fcad9..d55063c7b5 100644
--- a/src/slic3r/Utils/PresetUpdater.cpp
+++ b/src/slic3r/Utils/PresetUpdater.cpp
@@ -35,6 +35,10 @@ using Slic3r::GUI::Config::Snapshot;
 using Slic3r::GUI::Config::SnapshotDB;
 
 
+
+// FIXME: Incompat bundle resolution doesn't deal with inherited user presets
+
+
 namespace Slic3r {
 
 
@@ -101,6 +105,17 @@ struct Incompat
 		, vendor(std::move(vendor))
 	{}
 
+	void remove() {
+		// Remove the bundle file
+		fs::remove(bundle);
+
+		// Look for an installed index and remove it too if any
+		const fs::path installed_idx = bundle.replace_extension("idx");
+		if (fs::exists(installed_idx)) {
+			fs::remove(installed_idx);
+		}
+	}
+
 	friend std::ostream& operator<<(std::ostream& os , const Incompat &self) {
 		os << "Incompat(" << self.bundle.string() << ')';
 		return os;
@@ -113,25 +128,12 @@ struct Updates
 	std::vector<Update> updates;
 };
 
-static Semver get_slic3r_version()
-{
-	auto res = Semver::parse(SLIC3R_VERSION);
-
-	if (! res) {
-		const char *error = "Could not parse Slic3r version string: " SLIC3R_VERSION;
-		BOOST_LOG_TRIVIAL(error) << error;
-		throw std::runtime_error(error);
-	}
-
-	return *res;
-}
 
 wxDEFINE_EVENT(EVT_SLIC3R_VERSION_ONLINE, wxCommandEvent);
 
 
 struct PresetUpdater::priv
 {
-	const Semver ver_slic3r;
 	std::vector<Index> index_db;
 
 	bool enabled_version_check;
@@ -159,8 +161,7 @@ struct PresetUpdater::priv
 };
 
 PresetUpdater::priv::priv()
-	: ver_slic3r(get_slic3r_version())
-	, cache_path(fs::path(Slic3r::data_dir()) / "cache")
+	: cache_path(fs::path(Slic3r::data_dir()) / "cache")
 	, rsrc_path(fs::path(resources_dir()) / "profiles")
 	, vendor_path(fs::path(Slic3r::data_dir()) / "vendor")
 	, cancel(false)
@@ -383,25 +384,6 @@ Updates PresetUpdater::priv::get_config_updates() const
 			continue;
 		}
 
-		// Load 'installed' idx, if any.
-		// 'Installed' indices are kept alongside the bundle in the `vendor` subdir
-		// for bookkeeping to remember a cancelled update and not offer it again.
-		if (fs::exists(bundle_path_idx)) {
-			Index existing_idx;
-			try {
-				existing_idx.load(bundle_path_idx);
-
-				const auto existing_recommended = existing_idx.recommended();
-				if (existing_recommended != existing_idx.end() && recommended->config_version == existing_recommended->config_version) {
-					// The user has already seen (and presumably rejected) this update
-					BOOST_LOG_TRIVIAL(info) << boost::format("Downloaded index for `%1%` is the same as installed one, not offering an update.") % idx.vendor();
-					continue;
-				}
-			} catch (const std::exception & /* err */) {
-				BOOST_LOG_TRIVIAL(error) << boost::format("Could nto load installed index %1%") % bundle_path_idx;
-			}
-		}
-
 		const auto ver_current = idx.find(vp.config_version);
 		const bool ver_current_found = ver_current != idx.end();
 
@@ -424,6 +406,25 @@ Updates PresetUpdater::priv::get_config_updates() const
 		} else if (recommended->config_version > vp.config_version) {
 			// Config bundle update situation
 
+			// Load 'installed' idx, if any.
+			// 'Installed' indices are kept alongside the bundle in the `vendor` subdir
+			// for bookkeeping to remember a cancelled update and not offer it again.
+			if (fs::exists(bundle_path_idx)) {
+				Index existing_idx;
+				try {
+					existing_idx.load(bundle_path_idx);
+
+					const auto existing_recommended = existing_idx.recommended();
+					if (existing_recommended != existing_idx.end() && recommended->config_version == existing_recommended->config_version) {
+						// The user has already seen (and presumably rejected) this update
+						BOOST_LOG_TRIVIAL(info) << boost::format("Downloaded index for `%1%` is the same as installed one, not offering an update.") % idx.vendor();
+						continue;
+					}
+				} catch (const std::exception &err) {
+					BOOST_LOG_TRIVIAL(error) << boost::format("Could not load installed index at `%1%`: %2%") % bundle_path_idx % err.what();
+				}
+			}
+
 			// Check if the update is already present in a snapshot
 			const auto recommended_snap = SnapshotDB::singleton().snapshot_with_vendor_preset(vp.name, recommended->config_version);
 			if (recommended_snap != SnapshotDB::singleton().end()) {
@@ -485,12 +486,11 @@ void PresetUpdater::priv::perform_updates(Updates &&updates, bool snapshot) cons
 
 		BOOST_LOG_TRIVIAL(info) << boost::format("Deleting %1% incompatible bundles") % updates.incompats.size();
 
-		for (const auto &incompat : updates.incompats) {
+		for (auto &incompat : updates.incompats) {
 			BOOST_LOG_TRIVIAL(info) << '\t' << incompat;
-			fs::remove(incompat.bundle);
+			incompat.remove();
 		}
-	}
-	else if (updates.updates.size() > 0) {
+	} else if (updates.updates.size() > 0) {
 		if (snapshot) {
 			BOOST_LOG_TRIVIAL(info) << "Taking a snapshot...";
 			SnapshotDB::singleton().take_snapshot(*GUI::wxGetApp().app_config, Snapshot::SNAPSHOT_UPGRADE);
@@ -584,8 +584,8 @@ void PresetUpdater::slic3r_update_notify()
 
 	if (ver_online) {
 		// Only display the notification if the version available online is newer AND if we haven't seen it before
-		if (*ver_online > p->ver_slic3r && (! ver_online_seen || *ver_online_seen < *ver_online)) {
-			GUI::MsgUpdateSlic3r notification(p->ver_slic3r, *ver_online);
+		if (*ver_online > Slic3r::SEMVER && (! ver_online_seen || *ver_online_seen < *ver_online)) {
+			GUI::MsgUpdateSlic3r notification(Slic3r::SEMVER, *ver_online);
 			notification.ShowModal();
 			if (notification.disable_version_check()) {
 				app_config->set("version_check", "0");
@@ -628,11 +628,17 @@ PresetUpdater::UpdateResult PresetUpdater::config_update() const
 		const auto res = dlg.ShowModal();
 		if (res == wxID_REPLACE) {
 			BOOST_LOG_TRIVIAL(info) << "User wants to re-configure...";
+
+			// This effectively removes the incompatible bundles:
+			// (snapshot is taken beforehand)
 			p->perform_updates(std::move(updates));
+
 			GUI::ConfigWizard wizard(nullptr, GUI::ConfigWizard::RR_DATA_INCOMPAT);
+
 			if (! wizard.run(GUI::wxGetApp().preset_bundle, this)) {
 				return R_INCOMPAT_EXIT;
 			}
+
 			GUI::wxGetApp().load_current_presets();
 			return R_INCOMPAT_CONFIGURED;
 		} else {
diff --git a/src/slic3r/Utils/PrintHost.cpp b/src/slic3r/Utils/PrintHost.cpp
index e9e39e6957..ab52b23443 100644
--- a/src/slic3r/Utils/PrintHost.cpp
+++ b/src/slic3r/Utils/PrintHost.cpp
@@ -170,8 +170,6 @@ void PrintHostJobQueue::priv::bg_thread_main()
         }
     } catch (const std::exception &e) {
         emit_error(e.what());
-    } catch (...) {
-        emit_error("Unknown exception");
     }
 
     // Cleanup leftover files, if any
diff --git a/src/slic3r/Utils/Serial.cpp b/src/slic3r/Utils/Serial.cpp
index acfd5fafd0..5944646926 100644
--- a/src/slic3r/Utils/Serial.cpp
+++ b/src/slic3r/Utils/Serial.cpp
@@ -6,6 +6,7 @@
 #include <chrono>
 #include <thread>
 #include <fstream>
+#include <exception>
 #include <stdexcept>
 
 #include <boost/algorithm/string/predicate.hpp>
@@ -71,13 +72,10 @@ void parse_hardware_id(const std::string &hardware_id, SerialPortInfo &spi)
 	std::regex pattern("USB\\\\.*VID_([[:xdigit:]]+)&PID_([[:xdigit:]]+).*");
 	std::smatch matches;
 	if (std::regex_match(hardware_id, matches, pattern)) {
-		try {
-			vid = std::stoul(matches[1].str(), 0, 16);
-			pid = std::stoul(matches[2].str(), 0, 16);
-			spi.id_vendor = vid;
-			spi.id_product = pid;
-		}
-		catch (...) {}
+		vid = std::stoul(matches[1].str(), 0, 16);
+		pid = std::stoul(matches[2].str(), 0, 16);
+		spi.id_vendor = vid;
+		spi.id_product = pid;
 	}
 }
 #endif
diff --git a/src/slic3r/Utils/Time.hpp b/src/slic3r/Utils/Time.hpp
index 7b670bd3ee..6a1aefa188 100644
--- a/src/slic3r/Utils/Time.hpp
+++ b/src/slic3r/Utils/Time.hpp
@@ -2,7 +2,7 @@
 #define slic3r_Utils_Time_hpp_
 
 #include <string>
-#include <time.h>
+#include <ctime>
 
 namespace Slic3r {
 namespace Utils {