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Pin the flush-matrix purge for a single filament

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With single_extruder_multi_material and purge_in_prime_tower, the flush
matrix replaces the prime volume and its average is non-zero for one
filament, so the estimate reports a tower. normalize_fdm_2 clears the tower
for that same plate, so none is printed: the estimate answers how big a
tower is, never whether there is one, and a caller reading a non-zero depth
as "a tower is printed" reserves space for, or blocks on, a phantom. The
test asserts that disagreement directly.

Type1 is the exception in the same case, because it decides from its
per-filament purge list and a lone filament is never changed to. The scene
reads the same estimate either way. Type2 is the default for every non-Bambu
printer, and so for every IDEX/IQEX one.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Clifford Garwood
2026-09-18 01:41:42 -04:00
co-authored by Claude Opus 5
parent 3c31856b85
commit 182dbd55e4
1 changed files with 32 additions and 0 deletions
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tests/libslic3r/test_wipe_tower_estimate.cpp
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@@ -179,6 +179,38 @@ TEST_CASE("A single filament only gets a tower when one is printed anyway", "[Wi
CHECK_THAT(estimate(config, 1, 0.2, 5.).depth, WithinAbs(WipeTower::get_limit_depth_by_height(5.f), 1e-9));
}
TEST_CASE("A single filament still gets a tower when the flush matrix purges", "[WipeTowerEstimate]") {
// SEMM + purge_in_prime_tower purges the flush matrix, whose average is non-zero for one
// filament (empty or not - filament_minimal_purge_on_wipe_tower folds in at 15 mm3). So the
// estimate reports a tower here while normalize_fdm_2 clears it: this answers how big a
// tower is, never whether there is one. Reading a non-zero depth as "a tower is printed"
// reserves space for, or blocks on, a phantom.
DynamicPrintConfig config = make_config();
config.set_key_value("single_extruder_multi_material", new ConfigOptionBool(true));
config.set_key_value("purge_in_prime_tower", new ConfigOptionBool(true));
// One nozzle, two filaments: a 2x2 block, so the fold over nozzles has one term.
config.set_key_value("flush_volumes_matrix", new ConfigOptionFloats({0., 140., 140., 0.}));
CHECK(estimate(config, 1, 0.2, 100.).depth > 0.);
// Type1 is the exception: the flush volume replaces Type2's purge volume, while Type1 decides
// from its per-filament purge list, and one filament is never changed to. A Type1 printer
// therefore reserves nothing here - and the scene draws nothing either, since it reads the
// same estimate, so the two still agree. Type2 is the default for every non-Bambu printer,
// which is what an IDEX/IQEX printer is.
CHECK_THAT(estimate(config, 1, 0.2, 100., WipeTowerType::Type1).depth, WithinAbs(0., 1e-9));
// The disagreement itself: same config, and the slicer's own rule prints no tower.
DynamicPrintConfig normalized = config;
normalized.set_key_value("enable_prime_tower", new ConfigOptionBool(true));
normalized.normalize_fdm_2(/*num_objects=*/1, /*used_filaments=*/1);
CHECK_FALSE(normalized.option<ConfigOptionBool>("enable_prime_tower")->value);
// Same plate, same matrix, purging back in the object: nothing to reserve.
config.set_key_value("purge_in_prime_tower", new ConfigOptionBool(false));
CHECK_THAT(estimate(config, 1, 0.2, 100.).depth, WithinAbs(0., 1e-9));
}
TEST_CASE("A tool change reserves a tower even with nothing to purge", "[WipeTowerEstimate]") {
// The purge volumes are configurable down to zero, but the tool changes are still printed
// on the tower and both planners still floor it - so the estimate has to floor it too.