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Belt: decide the fan band per extrusion segment

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A tilted layer runs from the belt to the top of the part, so a wall loop
that starts above the belt still passes along it. Tagging only the path's
first point left such loops out of the band entirely; the band is now
evaluated at each segment, with the tag capped where the fan stops
depending on it.
This commit is contained in:
harrierpigeon
2026-10-02 02:36:13 -05:00
parent 461063856d
commit 441ae8e877
1 changed files with 21 additions and 8 deletions
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src/libslic3r/GCode.cpp
+21 -8
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@@ -8507,14 +8507,25 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
// the speed fade tracks perpendicular distance from the plane on
// belt printers; otherwise this falls back to the slicing layer id.
const int _layer = this->effective_layer_index_for_point(path_point_mm);
// Belt printers: tell the cooling buffer which band above the belt this path starts in,
// once per layer and at every change (CoolingBuffer::apply_belt_band_fan consumes it).
if (m_enable_cooling_markers && m_config.belt_printer.value &&
(m_belt_band_tag_layer != m_layer_index || m_belt_band_tag != _layer)) {
gcode += ";_BELT_BAND:" + std::to_string(_layer) + "\n";
m_belt_band_tag = _layer;
m_belt_band_tag_layer = m_layer_index;
}
// Belt printers: tell the cooling buffer which band above the belt the next extrusion is
// in (CoolingBuffer::apply_belt_band_fan consumes the tag). A tilted layer runs from the
// belt to the top of the part, so this is decided per segment, not per path; a tag is
// written once per layer and at every change, capped where the fan stops depending on it.
const bool belt_band_tags = m_enable_cooling_markers && m_config.belt_printer.value;
const int belt_band_cap = belt_band_tags
? std::max(m_config.close_fan_the_first_x_layers.get_at(m_writer->filament()->id()),
m_config.full_fan_speed_layer.get_at(m_writer->filament()->id())) + 1 : 0;
auto tag_belt_band = [this, &gcode, belt_band_tags, belt_band_cap, z = path_point_mm.z()](coord_t x, coord_t y) {
if (! belt_band_tags)
return;
const int band = std::min(this->effective_layer_index_for_point(Vec3d(unscale<double>(x), unscale<double>(y), z)), belt_band_cap);
if (m_belt_band_tag_layer != m_layer_index || m_belt_band_tag != band) {
gcode += ";_BELT_BAND:" + std::to_string(band) + "\n";
m_belt_band_tag = band;
m_belt_band_tag_layer = m_layer_index;
}
};
tag_belt_band(path.first_point().x(), path.first_point().y());
if (path_on_first_layer || object_layer_over_raft()) {
//BBS: for solid infill of first layer, speed can be higher as long as
//wall lines have be attached
@@ -8999,6 +9010,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
tempDescription += Slic3r::format(" | Old Flow Value: %0.5f Length: %0.5f",oldE, line_length);
}
}
tag_belt_band((line.a.x() + line.b.x()) / 2, (line.a.y() + line.b.y()) / 2);
if (path.z_contoured) {
// ZAA: Z anti-aliased extrusion with variable Z per point
Vec2d dest2d = this->point_to_gcode(line.b.to_point());
@@ -9129,6 +9141,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
const ProcessedPoint &processed_point = new_points[i];
const ProcessedPoint &pre_processed_point = new_points[i-1];
Vec3d p = this->point_to_gcode_quantized(processed_point.p);
tag_belt_band((pre_processed_point.p.x() + processed_point.p.x()) / 2, (pre_processed_point.p.y() + processed_point.p.y()) / 2);
if (m_enable_cooling_markers) {
if (enable_overhang_bridge_fan) {
cur_fan_enabled = check_overhang_fan(processed_point.overlap, path.role());