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Size the prime tower from the actual flush volumes

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Prime towers reserved depth from the prime volume alone, ignoring the flush
matrix: rib-wall towers in both the engine and the preview, and rectangle and
cone towers in the preview, which never carried the flush-aware estimate the
engine already used. The preview also read the print preset, which does not
carry the printer- and filament-scope keys the estimate needs and so silently
fell back to defaults. On multi-nozzle printers the flush matrix, which holds
one block per nozzle, was additionally read as a single block. The tower could
come out too small for the purge it has to hold.

The flush-based estimate also skipped the height-based minimum depth that the
prime-volume one applies, so low-flush prints could estimate a tower shallower
than the one that actually gets built.
This commit is contained in:
SoftFever
2026-08-06 17:58:41 +08:00
parent f9ed5843c0
commit 32a4e0fb37
5 changed files with 83 additions and 41 deletions
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src/libslic3r/GCode/WipeTower2.cpp
+49 -12
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@@ -2130,31 +2130,68 @@ std::pair<double, double> WipeTower2::get_wipe_tower_cone_base(double width, dou
}
// Static method to extract wipe_volumes[from][to] from the configuration.
std::vector<std::vector<float>> WipeTower2::extract_wipe_volumes(const PrintConfig& config)
// Takes a ConfigBase so the GUI's wipe tower size estimate can pass the plate's
// DynamicPrintConfig directly instead of materializing a full PrintConfig per call.
std::vector<std::vector<float>> WipeTower2::extract_wipe_volumes(const ConfigBase& config)
{
// Get wiping matrix to get number of extruders and convert vector<double> to vector<float>:
std::vector<float> wiping_matrix(cast<float>(config.flush_volumes_matrix.values));
auto scale = config.flush_multiplier.get_at(0);
// flush_volumes_matrix holds one filaments x filaments block per nozzle (written by
// PresetBundle::update_multi_material_filament_presets), so the filament count is
// sqrt(size / nozzles). One tower serves every nozzle and the filament to nozzle assignment is
// only decided later by ToolOrdering, so fold the blocks with std::max: the depth reserved here
// has to cover the worst nozzle. With a single nozzle the fold has one term.
const std::vector<double> &raw_matrix = config.option<ConfigOptionFloats>("flush_volumes_matrix")->values;
const auto *nozzle_diameter = config.option<ConfigOptionFloats>("nozzle_diameter");
size_t nozzle_nums = (nozzle_diameter == nullptr || nozzle_diameter->values.empty()) ? 1 : nozzle_diameter->values.size();
unsigned int number_of_extruders = (unsigned int)(sqrt(raw_matrix.size() / nozzle_nums) + EPSILON);
if (size_t(number_of_extruders) * number_of_extruders * nozzle_nums != raw_matrix.size()) {
// Saved for a different nozzle count (older project, or the printer was just switched):
// fall back to reading the whole option as one block, as this did before.
nozzle_nums = 1;
number_of_extruders = (unsigned int)(sqrt(raw_matrix.size()) + EPSILON);
}
// The values shall only be used when SEMM is enabled. The purging for other printers
// is determined by filament_minimal_purge_on_wipe_tower.
if (! config.purge_in_prime_tower.value || ! config.single_extruder_multi_material.value)
std::fill(wiping_matrix.begin(), wiping_matrix.end(), 0.f);
const bool purge = config.option<ConfigOptionBool>("purge_in_prime_tower")->value
&& config.option<ConfigOptionBool>("single_extruder_multi_material")->value;
// Extract purging volumes for each extruder pair:
std::vector<std::vector<float>> wipe_volumes;
const unsigned int number_of_extruders = (unsigned int)(sqrt(wiping_matrix.size())+EPSILON);
for (size_t i = 0; i<number_of_extruders; ++i)
wipe_volumes.push_back(std::vector<float>(wiping_matrix.begin()+i*number_of_extruders, wiping_matrix.begin()+(i+1)*number_of_extruders));
// Extract purging volumes for each extruder pair, each nozzle's block scaled by its own multiplier:
std::vector<std::vector<float>> wipe_volumes(number_of_extruders, std::vector<float>(number_of_extruders, 0.f));
if (purge) {
const auto *multiplier = config.option<ConfigOptionFloats>("flush_multiplier");
for (size_t nozzle_id = 0; nozzle_id < nozzle_nums; ++nozzle_id) {
const std::vector<double> block = get_flush_volumes_matrix(raw_matrix, nozzle_id, nozzle_nums);
const double scale = multiplier->get_at(nozzle_id);
for (unsigned int i = 0; i<number_of_extruders; ++i)
for (unsigned int j = 0; j<number_of_extruders; ++j)
wipe_volumes[i][j] = std::max<float>(wipe_volumes[i][j], float(block[size_t(i) * number_of_extruders + j]) * scale);
}
}
// Also include filament_minimal_purge_on_wipe_tower. This is needed for the preview.
const auto *minimal_purge = config.option<ConfigOptionFloats>("filament_minimal_purge_on_wipe_tower");
for (unsigned int i = 0; i<number_of_extruders; ++i)
for (unsigned int j = 0; j<number_of_extruders; ++j)
wipe_volumes[i][j] = std::max<float>(wipe_volumes[i][j] * scale, config.filament_minimal_purge_on_wipe_tower.get_at(j));
wipe_volumes[i][j] = std::max<float>(wipe_volumes[i][j], minimal_purge->get_at(j));
return wipe_volumes;
}
float WipeTower2::estimate_semm_flush_volume(const ConfigBase& config, size_t filaments_cnt)
{
const std::vector<std::vector<float>> wipe_volumes = extract_wipe_volumes(config);
if (wipe_volumes.empty()) // an empty flush matrix would make the average below 0/0
return 0.f;
float maximum = 0.f;
for (const std::vector<float> &v : wipe_volumes)
maximum += *std::max_element(v.begin(), v.end());
maximum = maximum * filaments_cnt / wipe_volumes.size();
// Orca: it's overshooting a bit, so let's reduce it a bit
maximum *= 0.6;
return maximum;
}
static float get_wipe_depth(float volume, float layer_height, float perimeter_width, float extra_flow, float extra_spacing, float width)
{
float length_to_extrude = (volume_to_length(volume, perimeter_width, layer_height)) / extra_flow;