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Fixed an issue where the Max Volumetric Speed doesn't consider the Filament Flow Ratio (#9218)

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* Rework extrusion-per-mm and speed-cap logic to enforce max vol speed

* Fix _mm3_per_mm typo
This commit is contained in:
Shantanu Nair 2025-04-20 21:30:10 +05:30 • committed by GitHub
parent 2349ea063d
commit ee7ebda584
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2 changed files with 11 additions and 3 deletions
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12
src/libslic3r/GCode.cpp
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@ -5270,8 +5270,11 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
gcode += m_writer.set_jerk_xy(jerk);
}
// calculate extrusion length per distance unit
// calculate effective extrusion length per distance unit (e_per_mm)
double filament_flow_ratio = m_config.option<ConfigOptionFloats>("filament_flow_ratio")->get_at(0);
// We set _mm3_per_mm to effectove flow = Geometric volume * print flow ratio * filament flow ratio * role-based-flow-ratios
auto _mm3_per_mm = path.mm3_per_mm * this->config().print_flow_ratio;
_mm3_per_mm *= filament_flow_ratio;
if (path.role() == erTopSolidInfill)
_mm3_per_mm *= m_config.top_solid_infill_flow_ratio;
else if (path.role() == erBottomSurface)
@ -5280,9 +5283,12 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
_mm3_per_mm *= m_config.internal_bridge_flow;
else if(sloped)
_mm3_per_mm *= m_config.scarf_joint_flow_ratio;
// Effective extrusion length per distance unit = (filament_flow_ratio/cross_section) * mm3_per_mm / print flow ratio
// m_writer.extruder()->e_per_mm3() below is (filament flow ratio / cross-sectional area)
double e_per_mm = m_writer.extruder()->e_per_mm3() * _mm3_per_mm;
e_per_mm /= filament_flow_ratio;
// set speed
if (speed == -1) {