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Belt purge: detect filament changes by scanning the ordering, not the first layer's flag

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ToolOrdering::has_wipe_tower() reads the first layer's flag. On a belt the first layer may
be a brim apron band, which carries neither object nor support and never gets the flag, so
with a brim the purge plan returned early and nothing was purged. Scan the layers for a
change.
This commit is contained in:
harrierpigeon
2026-10-02 01:00:36 -05:00
parent 2ae41bb0ef
commit e8926efbe3
1 changed files with 12 additions and 3 deletions
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src/libslic3r/BeltPurge.cpp
+12 -3
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@@ -165,9 +165,18 @@ void Print::_plan_belt_purge()
if (m_wipe_tower_data.tool_ordering.empty() || m_wipe_tower_data.tool_ordering.last_extruder() == unsigned(-1))
throw Slic3r::SlicingError("The print is empty. The model is not printable with current print settings.");
if (!m_wipe_tower_data.tool_ordering.has_wipe_tower())
// No toolchanges anywhere, nothing to purge.
return;
// Is there any filament change at all? Not ToolOrdering::has_wipe_tower(): that reads the
// FIRST layer's flag, and on a belt the first layer may be a brim apron band, which carries
// neither object nor support and so never gets the flag even when the print changes filament.
{
bool any_change = false;
unsigned int cur = m_wipe_tower_data.tool_ordering.first_extruder();
for (const auto &lt : m_wipe_tower_data.tool_ordering.layer_tools())
for (const unsigned int e : lt.extruders)
if (e != cur) { any_change = true; cur = e; }
if (! any_change)
return;
}
this->throw_if_canceled();