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fix: keep support interface intact with variable layer heights #696

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Merged
bluetianyu merged 1 commit into from
Aug 18, 2026
Merged

fix: keep support interface intact with variable layer heights #696

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9 changes: 9 additions & 0 deletions src/libslic3r/Support/SupportMaterial.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3157,6 +3157,15 @@ void PrintObjectSupportMaterial::trim_support_layers_by_object(
if (object_layer.bottom_z() > support_layer.print_z + gap_extra_above - EPSILON)
break;

// Skip the object layer directly supported by this top contact layer: its lslices
// cover the overhang itself, so trimming by it would cut away the contact area.
// With variable layer heights the synchronised gap is shorter than the configured
// gap, so this layer used to fall inside the trimming window and removed ~80% of
// the contact surface.
if (support_layer.layer_type == SupporLayerType::TopContact &&
i == support_layer.idx_object_layer_above)
continue;

bool is_overlap = is_layers_overlap(support_layer, object_layer);
for (const ExPolygon& expoly : object_layer.lslices) {
// BBS
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