bed_screws: Add a helper tool for leveling bed screws

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/bed_screws.py

@@ -0,0 +1,119 @@
+# Helper script to adjust bed screws
+#
+# Copyright (C) 2019  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+
+def parse_coord(config, param):
+    pair = config.get(param).strip().split(',', 1)
+    try:
+        return (float(pair[0]), float(pair[1]))
+    except:
+        raise config.error("%s:%s needs to be an x,y coordinate" % (
+            config.get_name(), param))
+
+class BedScrews:
+    def __init__(self, config):
+        self.printer = config.get_printer()
+        self.state = None
+        self.current_screw = 0
+        self.adjust_again = False
+        # Read config
+        screws = []
+        fine_adjust = []
+        for i in range(99):
+            prefix = "screw%d" % (i + 1,)
+            if config.get(prefix, None) is None:
+                break
+            screw_coord = parse_coord(config, prefix)
+            screw_name = "screw at %.3f,%.3f" % screw_coord
+            screw_name = config.get(prefix + "_name", screw_name)
+            screws.append((screw_coord, screw_name))
+            if config.get(prefix + "_fine_adjust", None) is not None:
+                fine_coord = parse_coord(config, prefix + "_fine_adjust")
+                fine_adjust.append((fine_coord, screw_name))
+        if len(screws) < 3:
+            raise config.error("bed_screws: Must have at least three screws")
+        self.states = {'adjust': screws, 'fine': fine_adjust}
+        self.speed = config.getfloat('speed', 50., above=0.)
+        self.lift_speed = config.getfloat('probe_speed', 5., above=0.)
+        self.horizontal_move_z = config.getfloat('horizontal_move_z', 5.)
+        self.probe_z = config.getfloat('probe_height', 0.)
+        # Register command
+        self.gcode = self.printer.lookup_object('gcode')
+        self.gcode.register_command("BED_SCREWS_ADJUST",
+                                    self.cmd_BED_SCREWS_ADJUST,
+                                    desc=self.cmd_BED_SCREWS_ADJUST_help)
+    def move(self, coord, speed):
+        toolhead = self.printer.lookup_object('toolhead')
+        curpos = toolhead.get_position()
+        for i in range(len(coord)):
+            if coord[i] is not None:
+                curpos[i] = coord[i]
+        try:
+            toolhead.move(curpos, speed)
+        except homing.EndstopError as e:
+            raise self.gcode.error(str(e))
+    def move_to_screw(self, state, screw):
+        # Move up, over, and then down
+        self.move((None, None, self.horizontal_move_z), self.lift_speed)
+        coord, name = self.states[state][screw]
+        self.move((coord[0], coord[1], self.horizontal_move_z), self.speed)
+        self.move((coord[0], coord[1], self.probe_z), self.lift_speed)
+        # Update state
+        self.state = state
+        self.current_screw = screw
+        # Register commands
+        self.gcode.respond_info(
+            "Adjust %s. Then run ACCEPT, ADJUSTED, or ABORT\n"
+            "Use ADJUSTED if a significant screw adjustment is made" % (name,))
+        self.gcode.register_command('ACCEPT', self.cmd_ACCEPT,
+                                    desc=self.cmd_ACCEPT_help)
+        self.gcode.register_command('ADJUSTED', self.cmd_ADJUSTED,
+                                    desc=self.cmd_ADJUSTED_help)
+        self.gcode.register_command('ABORT', self.cmd_ABORT,
+                                    desc=self.cmd_ABORT_help)
+    def unregister_commands(self):
+        self.gcode.register_command('ACCEPT', None)
+        self.gcode.register_command('ADJUSTED', None)
+        self.gcode.register_command('ABORT', None)
+    cmd_BED_SCREWS_ADJUST_help = "Tool to help adjust bed leveling screws"
+    def cmd_BED_SCREWS_ADJUST(self, params):
+        if self.state is not None:
+            raise self.gcode.error(
+                "Already in bed_screws helper; use ABORT to exit")
+        self.adjust_again = False
+        self.move((None, None, self.horizontal_move_z), self.speed)
+        self.move_to_screw('adjust', 0)
+    cmd_ACCEPT_help = "Accept bed screw position"
+    def cmd_ACCEPT(self, params):
+        self.unregister_commands()
+        if self.current_screw + 1 < len(self.states[self.state]):
+            # Continue with next screw
+            self.move_to_screw(self.state, self.current_screw + 1)
+            return
+        if self.adjust_again:
+            # Retry coarse adjustments
+            self.adjust_again = False
+            self.move_to_screw('adjust', 0)
+            return
+        if self.state == 'adjust' and self.states['fine']:
+            # Perform fine screw adjustments
+            self.move_to_screw('fine', 0)
+            return
+        # Done
+        self.state = None
+        self.move((None, None, self.horizontal_move_z), self.lift_speed)
+        self.gcode.respond_info("Bed screws tool completed successfully")
+    cmd_ADJUSTED_help = "Accept bed screw position after notable adjustment"
+    def cmd_ADJUSTED(self, params):
+        self.unregister_commands()
+        self.adjust_again = True
+        self.cmd_ACCEPT(params)
+    cmd_ABORT_help = "Abort bed screws tool"
+    def cmd_ABORT(self, params):
+        self.unregister_commands()
+        self.state = None
+
+def load_config(config):
+    return BedScrews(config)