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Belt cooling: keep the fan off in the band inside the layer cooling pass

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The band was a second pass over the finished layer that fought the fan commands
the layer pass had already written (overhang, bridge and resume requests). The
generator now marks where each segment enters and leaves the band and the layer
pass treats the band as the strongest fan request, so there is one place that
decides the fan.
This commit is contained in:
harrierpigeon
2026-10-02 12:46:44 -05:00
parent 5ac0dd19d0
commit d35af1806a
6 changed files with 95 additions and 185 deletions
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src/libslic3r/GCode.cpp
+10 -15
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@@ -8507,25 +8507,20 @@ 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 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) {
// Belt printers: a tilted layer runs from the belt to the top of the part, so the
// "first layers" the fan stays off for are a band along the belt. Mark where the
// extrusion enters and leaves it, per segment, for the cooling buffer.
const bool belt_band_tags = m_enable_cooling_markers && m_config.belt_printer.value;
const int belt_band_layers = belt_band_tags ? m_config.close_fan_the_first_x_layers.get_at(m_writer->filament()->id()) : 0;
auto tag_belt_band = [this, &gcode, belt_band_tags, belt_band_layers, 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;
const bool in_band = this->effective_layer_index_for_point(Vec3d(unscale<double>(x), unscale<double>(y), z)) < belt_band_layers;
if (in_band != m_belt_in_band) {
gcode += in_band ? ";_BELT_BAND_START\n" : ";_BELT_BAND_END\n";
m_belt_in_band = in_band;
}
};
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