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Belt: warn when the purge tower is enabled but the project has no tower object

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The purge tower is a model object the GUI creates and sizes, and libslic3r
only purges into one that exists. A multi-filament belt project sliced from
the CLI without it changed filament with nowhere to purge, silently.

Raised in Hanif Koh's review of #14394.
This commit is contained in:
harrierpigeon
2026-10-02 01:11:59 -05:00
parent 556569c0e3
commit 360a68e078
2 changed files with 45 additions and 0 deletions
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tests/fff_print/test_print.cpp
+30
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@@ -336,6 +336,36 @@ TEST_CASE("Belt purge planning requires its managed purge object", "[Print][Purg
CHECK_FALSE(print.has_wipe_tower());
}
// The GUI creates the purge tower object; a project sliced without one (the CLI) must say
// that its filament changes go unpurged.
TEST_CASE("Belt purge tower enabled without a tower object warns", "[Print][PurgeTower][belt]")
{
DynamicPrintConfig config = multifilament_config(2, {
{ "belt_printer", 1 },
{ "enable_belt_purge_tower", 1 },
{ "layer_change_gcode", "G92 E0\n" }
});
auto purge_warnings = [](Print &print) {
std::vector<StringObjectException> warnings;
print.validate(&warnings);
return std::count_if(warnings.begin(), warnings.end(), [](const StringObjectException &w) {
return w.opt_key == "enable_belt_purge_tower";
});
};
Model model;
Print print;
build_cubes(model, print, config, /*n=*/2, /*overlap=*/false);
model.objects[1]->config.set_key_value("extruder", new ConfigOptionInt(2));
print.apply(model, config);
REQUIRE(print.extruders().size() > 1);
CHECK(purge_warnings(print) == 1);
model.objects.front()->config.set_key_value("belt_purge_tower_object", new ConfigOptionBool(true));
print.apply(model, config);
CHECK(purge_warnings(print) == 0);
}
TEST_CASE("Belt purge rejects multiple managed purge objects", "[Print][PurgeTower][Regression]")
{
DynamicPrintConfig config = multifilament_config(2, {