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Wait for the toolchange temperature on the wipe tower

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Adds a printer option that picks up the new tool without a blocking temperature
wait, travels to the wipe tower, and waits there right before purging, parked
beside the tower so the ooze from the heat-up lands next to it rather than on the
model. The incoming filament's target is raised ahead of the tool change, so the
heat-up overlaps both the change itself and the travel to the tower.

Off by default, and only offered for multi-extruder printers using a Type 2 wipe
tower; the generic toolchanger profile enables it.
This commit is contained in:
SoftFever
2026-08-06 12:24:00 +08:00
parent b97ca3c0ac
commit 408db4b3b0
13 changed files with 895 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
src/libslic3r/GCode.cpp
View File

@@ -1554,7 +1554,8 @@ static std::vector<Vec2d> get_path_of_change_filament(const Print& print)
interface_temp = gcodegen.config().nozzle_temperature_range_high.get_at(new_extruder_id);
toolchange_temp_override = interface_temp;
}
toolchange_gcode_str = gcodegen.set_extruder(new_extruder_id, tcr.print_z, false, toolchange_temp_override); // TODO: toolchange_z vs print_z
toolchange_gcode_str = gcodegen.set_extruder(new_extruder_id, tcr.print_z, false, toolchange_temp_override,
WipeTower2::wait_for_temp_enabled(gcodegen.m_config)); // TODO: toolchange_z vs print_z
if (!travel_to_tower_now && !tcr.priming && WipeTower2::use_gap_wall(gcodegen.m_config)) {
// The tool changed in place (multi-tool printer without ramming), so the
// tower entry is the tcr's own positioning move — a straight line across
@@ -1705,7 +1706,7 @@ static std::vector<Vec2d> get_path_of_change_filament(const Print& print)
std::string trimmed = line;
trimmed.erase(0, trimmed.find_first_not_of(" \t"));
bool skip_line = false;
if (boost::starts_with(trimmed, "M109")) {
if (boost::starts_with(trimmed, "M109") && trimmed.find(WipeTower2::wait_for_temp_tag()) == std::string::npos) {
bool matches_extruder = true;
if (trimmed.find('T') != std::string::npos)
matches_extruder = trimmed.find(t_token) != std::string::npos;
@@ -8939,7 +8940,7 @@ void GCode::update_placeholder_parser_with_variant_params()
}
}
std::string GCode::set_extruder(unsigned int new_filament_id, double print_z, bool by_object, int toolchange_temp_override)
std::string GCode::set_extruder(unsigned int new_filament_id, double print_z, bool by_object, int toolchange_temp_override, bool defer_temp_wait)
{
int new_extruder_id = get_extruder_id(new_filament_id);
if (!m_writer.need_toolchange(new_filament_id))
@@ -9046,6 +9047,24 @@ std::string GCode::set_extruder(unsigned int new_filament_id, double print_z, bo
if (toolchange_temp_override > 0)
new_filament_temp = toolchange_temp_override;
// With wait_for_temp_on_wipe_tower the blocking M109 is deferred to the wipe tower, so raise
// the incoming filament's target here — ahead of the tool change rather than after it — and
// let the heat-up overlap the change itself as well as the travel to the tower. The command
// always carries an explicit tool index (the option is off for single extruder MM, so the
// writer emits one), leaving the outgoing filament that pre_toolchange just dropped to its
// standby temperature alone. nozzle_temperature == 0 means "use the first layer temperature".
if (defer_temp_wait) {
// Target what the tower will wait on. It waits on the first layer temperature not only on
// the first layer but also while priming, which runs before any layer is set: there
// on_first_layer() is false and print_z is the initial layer height, so neither test above
// catches it. nozzle_temperature == 0 means "use the first layer temperature" as well.
int preheat_temp = new_filament_temp;
if (toolchange_temp_override <= 0 && (m_layer == nullptr || preheat_temp <= 0))
preheat_temp = m_config.nozzle_temperature_initial_layer.get_at(new_fi);
if (preheat_temp > 0)
gcode += m_writer.set_temperature(preheat_temp, false, new_filament_id);
}
Vec3d nozzle_pos = m_writer.get_position();
float old_retract_length, old_retract_length_toolchange, wipe_volume;
int old_filament_temp, old_filament_e_feedrate;
@@ -9349,8 +9368,10 @@ std::string GCode::set_extruder(unsigned int new_filament_id, double print_z, bo
}
check_add_eol(gcode);
}
// Set the new extruder to the operating temperature.
if (m_ooze_prevention.enable)
// Set the new extruder to the operating temperature. With defer_temp_wait the target was
// already raised before the tool change and the blocking wait belongs to the wipe tower
// generator, so there is nothing left to restore here.
if (m_ooze_prevention.enable && !defer_temp_wait)
gcode += m_ooze_prevention.post_toolchange(*this);
if (m_config.enable_pressure_advance.get_at(new_filament_id)) {

2
src/libslic3r/GCode.hpp
View File

@@ -262,7 +262,7 @@ public:
std::string retract(bool toolchange = false, bool is_last_retraction = false, LiftType lift_type = LiftType::NormalLift, bool apply_instantly = false, ExtrusionRole role = erNone);
// extra_retract forwards a PETG pre-extrusion over-extrusion; default 0 -> identical to the plain deretract.
std::string unretract(float extra_retract = 0.f) { return m_writer.unlift() + m_writer.unretract(extra_retract); }
std::string set_extruder(unsigned int extruder_id, double print_z, bool by_object=false, int toolchange_temp_override = -1);
std::string set_extruder(unsigned int extruder_id, double print_z, bool by_object=false, int toolchange_temp_override = -1, bool defer_temp_wait = false);
bool is_BBL_Printer();
WipeTowerType wipe_tower_type();

123
src/libslic3r/GCode/WipeTower2.cpp
View File

@@ -413,6 +413,7 @@ public:
const Vec2f& pos() const { return m_current_pos; }
const Vec2f start_pos_rotated() const { return m_start_pos; }
const Vec2f pos_rotated() const { return this->rotate(m_current_pos); }
const Vec2f rotated(const Vec2f &pt) const { return this->rotate(pt); }
float elapsed_time() const { return m_elapsed_time; }
float get_and_reset_used_filament_length() { float temp = m_used_filament_length; m_used_filament_length = 0.f; return temp; }
@@ -624,10 +625,13 @@ public:
}
// Set extruder temperature, don't wait by default.
WipeTowerWriter2& set_extruder_temp(int temperature, bool wait = false)
WipeTowerWriter2& set_extruder_temp(int temperature, bool wait = false, const std::string& comment = std::string())
{
flush_planner_queue();
m_gcode += "M" + std::to_string(wait ? 109 : 104) + " S" + std::to_string(temperature) + "\n";
m_gcode += "M" + std::to_string(wait ? 109 : 104) + " S" + std::to_string(temperature);
if (!comment.empty())
m_gcode += " " + comment;
m_gcode += "\n";
return *this;
}
@@ -1006,6 +1010,13 @@ bool WipeTower2::use_gap_wall(const PrintConfig& config)
return config.prime_tower_skip_points.value && config.wipe_tower_wall_type.value != wtwCone;
}
bool WipeTower2::wait_for_temp_enabled(const PrintConfig& config)
{
// SEMM runs its own unload/load temperature sequence; the GUI hides the option
// there but a profile may still carry it set.
return config.wait_for_temp_on_wipe_tower.value && !config.single_extruder_multi_material.value;
}
WipeTower2::WipeTower2(const PrintConfig& config, const PrintRegionConfig& default_region_config,int plate_idx, Vec3d plate_origin, const std::vector<std::vector<float>>& wiping_matrix, size_t initial_tool) :
m_semm(config.single_extruder_multi_material.value),
m_enable_filament_ramming(config.enable_filament_ramming.value),
@@ -1035,7 +1046,8 @@ WipeTower2::WipeTower2(const PrintConfig& config, const PrintRegionConfig& defau
m_wall_type((int)config.wipe_tower_wall_type),
m_use_gap_wall(use_gap_wall(config)),
m_enable_tower_interface_features(config.enable_tower_interface_features.value),
m_enable_tower_interface_cooldown_during_tower(config.enable_tower_interface_cooldown_during_tower.value)
m_enable_tower_interface_cooldown_during_tower(config.enable_tower_interface_cooldown_during_tower.value),
m_wait_for_temp_on_wipe_tower(wait_for_temp_enabled(config))
{
// Read absolute value of first layer speed, if given as percentage,
// it is taken over following default. Speeds from config are not
@@ -1085,6 +1097,7 @@ WipeTower2::WipeTower2(const PrintConfig& config, const PrintRegionConfig& defau
m_bed_bottom_left = m_bed_shape == RectangularBed
? Vec2f(bed_points.front().x(), bed_points.front().y())
: Vec2f::Zero();
m_bed_polygon = Polygon::new_scale(bed_points);
}
@@ -1236,7 +1249,7 @@ std::vector<WipeTower::ToolChangeResult> WipeTower2::prime(
unsigned int tool = tools[idx_tool];
m_left_to_right = true;
toolchange_Change(writer, tool, m_filpar[tool].material); // Select the tool, set a speed override for soluble and flex materials.
toolchange_Change(writer, tool, m_filpar[tool].material, m_filpar[tool].first_layer_temperature, false); // Select the tool, set a speed override for soluble and flex materials.
toolchange_Load(writer, cleaning_box); // Prime the tool.
if (idx_tool + 1 == tools.size()) {
// Last tool should not be unloaded, but it should be wiped enough to become of a pure color.
@@ -1355,13 +1368,19 @@ WipeTower::ToolChangeResult WipeTower2::tool_change(size_t tool)
toolchange_Unload(writer, cleaning_box, m_filpar[m_current_tool].material,
(is_first_layer() ? m_filpar[m_current_tool].first_layer_temperature : m_filpar[m_current_tool].temperature),
new_tool_temp);
toolchange_Change(writer, tool, m_filpar[tool].material); // Change the tool, set a speed override for soluble and flex materials.
// Wait-at-tower target: the interface temp when an interface boost applies on this layer,
// otherwise the print temp (nozzle_temperature == 0 means "use the first layer temp").
int wait_for_temp = interface_layer && m_filpar[tool].interface_print_temperature > 0 ?
m_filpar[tool].interface_print_temperature :
(is_first_layer() || m_filpar[tool].temperature == 0 ? m_filpar[tool].first_layer_temperature : m_filpar[tool].temperature);
toolchange_Change(writer, tool, m_filpar[tool].material, wait_for_temp, true); // Change the tool, set a speed override for soluble and flex materials.
toolchange_Load(writer, cleaning_box);
writer.travel(writer.x(), writer.y()-m_perimeter_width); // cooling and loading were done a bit down the road
int base_temp = is_first_layer() ? m_filpar[tool].first_layer_temperature : m_filpar[tool].temperature;
if (interface_layer) {
int interface_temp = m_filpar[tool].interface_print_temperature;
if (interface_temp > 0 && interface_temp != base_temp)
// With wait-for-temp-on-wipe-tower the toolchange already blocked for the interface temp.
if (interface_temp > 0 && interface_temp != base_temp && !m_wait_for_temp_on_wipe_tower)
writer.set_extruder_temp(interface_temp, true);
if (m_enable_tower_interface_cooldown_during_tower && interface_temp > 0 && interface_temp != base_temp)
writer.set_extruder_temp(base_temp, false);
@@ -1671,7 +1690,9 @@ void WipeTower2::toolchange_Unload(
void WipeTower2::toolchange_Change(
WipeTowerWriter2 &writer,
const size_t new_tool,
const std::string& new_material)
const std::string& new_material,
const int wait_for_temp,
const bool wait_beside_tower)
{
// Ask the writer about how much of the old filament we consumed:
if (m_current_tool < m_used_filament_length.size())
@@ -1685,6 +1706,90 @@ void WipeTower2::toolchange_Change(
if (m_is_mk4mmu3)
writer.switch_filament_monitoring(true);
const bool wait_for_temp_here = m_wait_for_temp_on_wipe_tower && wait_for_temp > 0;
// The Tn above was issued without a blocking temperature wait (GCode::set_extruder only raises
// the target, ahead of the Tn); block here, before the deretraction below, which must not
// extrude on a cold nozzle. Like the Bambu H2C, park beside the tower for the heat-up so drool lands
// next to it instead of on its top surface — nearest x side first, then that side clamped
// toward the bed edge, then the far side, in place if all would leave the bed. Raw
// pre-rotated moves (see the repositioning move below) keep the writer's tracked position
// at the tower entry. The tag keeps the
// interface-temp deduplication pass in append_tcr2 from stripping the M109.
if (wait_for_temp_here && wait_beside_tower) {
// The rib wall and the stabilization cone bulge past the nominal width rectangle
// (widest near the bottom), and the first-layer brim is printed around the wall later
// in the layer — clear the widest of them, not just the rectangle, so the park point
// and its drool stay off the tower.
float min_x = 0.f, max_x = m_wipe_tower_width;
if (m_wall_type == (int)wtwRib) {
WipeTower::box_coordinates wt_box(Vec2f(0.f, 0.f), m_wipe_tower_width, m_layer_info->depth + m_perimeter_width);
const BoundingBox rib_bbox = get_extents(generate_rib_polygon(wt_box)); // the fillet stays within this bbox
min_x = std::min(min_x, unscaled<float>(rib_bbox.min.x()));
max_x = std::max(max_x, unscaled<float>(rib_bbox.max.x()));
} else if (m_wall_type == (int)wtwCone) {
const double support_scale = get_wipe_tower_cone_base(m_wipe_tower_width, m_wipe_tower_height, m_wipe_tower_depth,
m_wipe_tower_cone_angle).second;
const double z = m_no_sparse_layers ? (m_current_height + m_layer_info->height) : m_layer_info->z;
const double r = std::tan(Geometry::deg2rad(m_wipe_tower_cone_angle / 2.f)) * (m_wipe_tower_height - z);
const double w = m_layer_info->depth + m_perimeter_width;
if (r > 0.5 * w + 0.01) { // same guard as generate_support_cone_wall
const float bulge = float(std::sqrt(r * r - 0.25 * w * w) / support_scale);
min_x = std::min(min_x, m_wipe_tower_width / 2.f - bulge);
max_x = std::max(max_x, m_wipe_tower_width / 2.f + bulge);
}
}
if (is_first_layer()) {
const float brim = m_wipe_tower_brim_width < 0.f ? WipeTower::get_auto_brim_by_height(m_wipe_tower_height) :
m_wipe_tower_brim_width;
min_x -= brim;
max_x += brim;
}
constexpr float gap = 2.f;
constexpr float min_gap = 0.5f;
const bool on_left = writer.x() < m_wipe_tower_width / 2.f;
const float near_x = on_left ? min_x - gap : max_x + gap;
const float far_x = on_left ? max_x + gap : min_x - gap;
const Eigen::Rotation2Df to_bed(float(Geometry::deg2rad(m_wipe_tower_rotation_angle)));
auto park_pt_on_bed = [this, &writer, to_bed](float side_x) {
const Vec2f bed_pt = to_bed * (writer.rotated(Vec2f(side_x, writer.y())) + m_rib_offset) + m_wipe_tower_pos;
return m_bed_polygon.contains(Point::new_scale(bed_pt.x(), bed_pt.y()));
};
float park_x = near_x;
bool have_park = park_pt_on_bed(near_x);
if (!have_park) {
// The ideal near point hangs off the bed: pull it back to the bed edge as long
// as that still clears the tower envelope by min_gap (the BBL tower clamps its
// stop_pos against the bed the same way in append_tcr). Bisection, because with
// tower rotation and non-rectangular beds the bed edge is not axis-aligned.
const float limit_x = on_left ? min_x - min_gap : max_x + min_gap;
if (park_pt_on_bed(limit_x)) {
float on = limit_x, off = near_x;
for (int i = 0; i < 8; ++i) {
const float mid = 0.5f * (on + off);
if (park_pt_on_bed(mid))
on = mid;
else
off = mid;
}
park_x = on;
have_park = true;
}
}
if (!have_park && park_pt_on_bed(far_x)) {
park_x = far_x;
have_park = true;
}
if (have_park) {
const Vec2f stop = writer.rotated(Vec2f(park_x, writer.y()));
writer.feedrate(m_travel_speed * 60.f)
.append(std::string("G1 X") + Slic3r::float_to_string_decimal_point(stop.x())
+ " Y" + Slic3r::float_to_string_decimal_point(stop.y())
+ never_skip_tag() + "\n");
}
writer.set_extruder_temp(wait_for_temp, true, wait_for_temp_tag());
}
// Travel to where we assume we are. Custom toolchange or some special T code handling (parking extruder etc)
// gcode could have left the extruder somewhere, we cannot just start extruding. We should also inform the
// postprocessor that we absolutely want to have this in the gcode, even if it thought it is the same as before.
@@ -1695,6 +1800,10 @@ void WipeTower2::toolchange_Change(
+ never_skip_tag() + "\n"
);
// Priming has no tower to park beside — wait right at the priming line instead.
if (wait_for_temp_here && !wait_beside_tower)
writer.set_extruder_temp(wait_for_temp, true, wait_for_temp_tag());
writer.append("[deretraction_from_wipe_tower_generator]");
// The toolchange Tn command will be inserted later, only in case that the user does

14
src/libslic3r/GCode/WipeTower2.hpp
View File

@@ -22,6 +22,9 @@ class WipeTower2
{
public:
static const std::string never_skip_tag() { return "_GCODE_WIPE_TOWER_NEVER_SKIP_TAG"; }
// Marks the wait-for-temp-on-wipe-tower M109 so the interface-temp deduplication pass
// in WipeTowerIntegration::append_tcr2 does not strip it.
static const std::string wait_for_temp_tag() { return ";_WAIT_FOR_TEMP_ON_WIPE_TOWER"; }
static std::pair<double, double> get_wipe_tower_cone_base(double width, double height, double depth, double angle_deg);
static std::vector<std::vector<float>> extract_wipe_volumes(const PrintConfig& config);
@@ -38,6 +41,11 @@ public:
// Shared with the entry routing in GCode.cpp so the router and the tower agree.
static bool use_gap_wall(const PrintConfig& config);
// Whether the blocking toolchange temperature wait moves onto the wipe tower.
// Shared with the defer flag in GCode.cpp append_tcr2 so the deferral and the
// tower's tagged M109 can never disagree.
static bool wait_for_temp_enabled(const PrintConfig& config);
// x -- x coordinates of wipe tower in mm ( left bottom corner )
// y -- y coordinates of wipe tower in mm ( left bottom corner )
// width -- width of wipe tower in mm ( default 60 mm - leave as it is )
@@ -227,6 +235,7 @@ private:
size_t m_first_layer_idx = size_t(-1);
bool m_enable_tower_interface_features = false;
bool m_enable_tower_interface_cooldown_during_tower = false;
bool m_wait_for_temp_on_wipe_tower = false;
bool m_prev_layer_had_interface = false;
bool m_current_layer_has_interface = false;
@@ -263,6 +272,7 @@ private:
} m_bed_shape;
float m_bed_width; // width of the bed bounding box
Vec2f m_bed_bottom_left; // bottom-left corner coordinates (for rectangular beds)
Polygon m_bed_polygon; // printable_area contour (scaled)
float m_perimeter_width = 0.4f * Width_To_Nozzle_Ratio; // Width of an extrusion line, also a perimeter spacing for 100% infill.
float m_extrusion_flow = 0.038f; //0.029f;// Extrusion flow is derived from m_perimeter_width, layer height and filament diameter.
@@ -385,7 +395,9 @@ private:
void toolchange_Change(
WipeTowerWriter2 &writer,
const size_t new_tool,
const std::string& new_material);
const std::string& new_material,
const int wait_for_temp,
const bool wait_beside_tower);
void toolchange_Load(
WipeTowerWriter2 &writer,

2
src/libslic3r/Preset.cpp
View File

@@ -1423,7 +1423,7 @@ static std::vector<std::string> s_Preset_printer_options {
"use_relative_e_distances", "extruder_type", "use_firmware_retraction", "printer_notes",
"grab_length", "support_object_skip_flush", "physical_extruder_map",
"cooling_tube_retraction",
"cooling_tube_length", "high_current_on_filament_swap", "parking_pos_retraction", "extra_loading_move", "wipe_tower_type", "purge_in_prime_tower", "enable_filament_ramming", "tool_change_on_wipe_tower",
"cooling_tube_length", "high_current_on_filament_swap", "parking_pos_retraction", "extra_loading_move", "wipe_tower_type", "purge_in_prime_tower", "enable_filament_ramming", "tool_change_on_wipe_tower", "wait_for_temp_on_wipe_tower",
"z_offset",
"disable_m73", "preferred_orientation", "emit_machine_limits_to_gcode", "pellet_modded_printer", "support_multi_bed_types", "use_3mf", "default_bed_type", "bed_mesh_min","bed_mesh_max","bed_mesh_probe_distance", "adaptive_bed_mesh_margin", "enable_long_retraction_when_cut","long_retractions_when_cut","retraction_distances_when_cut",
"bed_temperature_formula", "nozzle_flush_dataset",

9
src/libslic3r/Print.cpp
View File

@@ -282,6 +282,14 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
|| opt_key == "wipe_tower_x"
|| opt_key == "wipe_tower_y"
|| opt_key == "wipe_tower_rotation_angle") {
// The tower gcode itself is position-independent (position and rotation are applied
// at export), except that the wait_for_temp_on_wipe_tower park bakes a bed-relative
// side choice into it (WipeTower2::toolchange_Change) — regenerate it when the tower
// moves. Gating on the old config is safe: both inputs of wait_for_temp_enabled
// invalidate psWipeTower themselves when they are part of the same diff.
if ((opt_key == "wipe_tower_x" || opt_key == "wipe_tower_y" || opt_key == "wipe_tower_rotation_angle")
&& WipeTower2::wait_for_temp_enabled(m_config))
steps.emplace_back(psWipeTower);
steps.emplace_back(psSkirtBrim);
} else if (
opt_key == "slicing_pipeline_plugin"
@@ -382,6 +390,7 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
|| opt_key == "wiping_volumes_extruders"
|| opt_key == "enable_filament_ramming"
|| opt_key == "tool_change_on_wipe_tower"
|| opt_key == "wait_for_temp_on_wipe_tower"
|| opt_key == "purge_in_prime_tower"
|| opt_key == "z_offset"
|| opt_key == "support_multi_bed_types"

11
src/libslic3r/PrintConfig.cpp
View File

@@ -6570,6 +6570,17 @@ void PrintConfigDef::init_fff_params()
def->mode = comAdvanced;
def->set_default_value(new ConfigOptionBool(false));
def = this->add("wait_for_temp_on_wipe_tower", coBool);
def->label = L("Wait for temperature on wipe tower");
def->tooltip = L("Pick up the new tool without waiting for it to reach printing temperature, travel to the wipe "
"tower, and wait for the temperature there, right before purging. Ooze from the heat-up lands on "
"the tower instead of the model, and the travel overlaps with the heating. "
"Only relevant for multi-extruder (multi-toolhead) printers using a Type 2 wipe tower. "
"The firmware or tool change macro must not wait for the temperature itself. "
"When disabled, the temperature wait is issued right after the tool change command.");
def->mode = comAdvanced;
def->set_default_value(new ConfigOptionBool(false));
def = this->add("wipe_tower_no_sparse_layers", coBool);
def->label = L("No sparse layers (beta)");

1
src/libslic3r/PrintConfig.hpp
View File

@@ -1660,6 +1660,7 @@ PRINT_CONFIG_CLASS_DEFINE(
((ConfigOptionBool, purge_in_prime_tower))
((ConfigOptionBool, enable_filament_ramming))
((ConfigOptionBool, tool_change_on_wipe_tower))
((ConfigOptionBool, wait_for_temp_on_wipe_tower))
((ConfigOptionBool, support_multi_bed_types))
((ConfigOptionBool, use_3mf))