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Fix overhang slowdown and fan applied to whole walls ahead of an overhang (#15945)

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This commit is contained in:
Ioannis Giannakas
2026-09-28 10:59:39 +01:00
committed by GitHub
parent 3df9c215f8
commit 7707487252
3 changed files with 231 additions and 97 deletions
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src/libslic3r/GCode.cpp
+28 -23
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@@ -7969,6 +7969,20 @@ double GCode::calc_max_volumetric_speed(const double layer_height, const double
return res;
}
// ORCA: Overlap at or below which the overhang fan switches on; negative when it does not depend on overlap
// (Overhang_threshold_none cools every external perimeter).
static float overhang_fan_overlap_threshold(int overhang_fan_threshold)
{
switch (overhang_fan_threshold) {
case (int) Overhang_threshold_1_4: return 0.9f;
case (int) Overhang_threshold_2_4: return 0.75f;
case (int) Overhang_threshold_3_4: return 0.5f;
case (int) Overhang_threshold_4_4: return 0.25f;
case (int) Overhang_threshold_bridge: return 0.05f;
default: return -1.f;
}
}
std::string GCode::_extrude(const ExtrusionPath &path, std::string description, double speed)
{
std::string gcode;
@@ -8311,6 +8325,13 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
ConfigOptionPercents overhang_overlap_levels({90, 75, 50, 25, 13, 0});
// ORCA: Lets the path be split where the overhang fan switches, not only where the speed changes.
// Bridges and overhang perimeters are cooled regardless of overlap.
float fan_overlap_threshold = -1.f;
if (FILAMENT_CONFIG(enable_overhang_bridge_fan) && m_enable_cooling_markers && path.role() != erBridgeInfill &&
path.role() != erOverhangPerimeter)
fan_overlap_threshold = overhang_fan_overlap_threshold(FILAMENT_CONFIG(overhang_fan_threshold));
if (NOZZLE_CONFIG(slowdown_for_curled_perimeters)){
ConfigOptionFloatsOrPercents dynamic_overhang_speeds(
{FloatOrPercent{100, true},
@@ -8331,7 +8352,8 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
FloatOrPercent{NOZZLE_CONFIG(overhang_4_4_speed).get_abs_value(ref_speed) * 100 / ref_speed, true}});
new_points = m_extrusion_quality_estimator.estimate_extrusion_quality(path, overhang_overlap_levels, dynamic_overhang_speeds,
ref_speed, speed, NOZZLE_CONFIG(slowdown_for_curled_perimeters));
ref_speed, speed, NOZZLE_CONFIG(slowdown_for_curled_perimeters),
fan_overlap_threshold);
}else{
ConfigOptionFloatsOrPercents dynamic_overhang_speeds(
{FloatOrPercent{100, true},
@@ -8350,7 +8372,8 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
FloatOrPercent{NOZZLE_CONFIG(bridge_speed) * 100 / ref_speed, true}});
new_points = m_extrusion_quality_estimator.estimate_extrusion_quality(path, overhang_overlap_levels, dynamic_overhang_speeds,
ref_speed, speed, NOZZLE_CONFIG(slowdown_for_curled_perimeters));
ref_speed, speed, NOZZLE_CONFIG(slowdown_for_curled_perimeters),
fan_overlap_threshold);
}
variable_speed = std::any_of(new_points.begin(), new_points.end(),
[speed](const ProcessedPoint &p) { return fabs(double(p.speed) - speed) > 1; }); // Ignore small speed variations (under 1mm/sec)
@@ -8502,28 +8525,10 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
if (role == erBridgeInfill || role == erOverhangPerimeter) { // ORCA: Split out bridge infill to internal and external to apply separate fan settings
return true;
}
switch (overhang_fan_threshold) {
case (int)Overhang_threshold_1_4:
return overlap <= 0.9f;
break;
case (int)Overhang_threshold_2_4:
return overlap <= 0.75f;
break;
case (int)Overhang_threshold_3_4:
return overlap <= 0.5f;
break;
case (int)Overhang_threshold_4_4:
return overlap <= 0.25f;
break;
case (int)Overhang_threshold_bridge:
return overlap <= 0.05f;
break;
case (int)Overhang_threshold_none:
if (overhang_fan_threshold == Overhang_threshold_none)
return is_external_perimeter(role);
break;
default:
return false;
}
const float overlap_threshold = overhang_fan_overlap_threshold(overhang_fan_threshold);
return overlap_threshold >= 0.f && overlap <= overlap_threshold;
};
std::string comment;