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fix: Eliminate redundant Z coordinates in ZAA gcode output

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extrude_to_xyz() unconditionally emitted Z on every extrusion move
via emit_xyz(), even when Z hadn't changed. With ZAA enabled, this
produced ~987K redundant Z coordinates (98.2% of all Z emissions),
causing 10-20% file bloat.

Now compares quantized Z values before and after, and only emits Z
when it actually differs at export precision (0.001mm). Reduces
ZAA gcode Z emissions from 1,038,468 to 50,022 while preserving
all legitimate contouring Z changes.
This commit is contained in:
Matthias Nott
2026-02-09 22:19:39 +01:00
parent 90cf80a1f8
commit d5b4d266c7
1 changed files with 9 additions and 1 deletions
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10
src/libslic3r/GCodeWriter.cpp
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@@ -911,6 +911,11 @@ std::string GCodeWriter::extrude_arc_to_xy(const Vec2d& point, const Vec2d& cent
std::string GCodeWriter::extrude_to_xyz(const Vec3d &point, double dE, const std::string &comment, bool force_no_extrusion)
{
// Check if Z actually changes (at export precision) before emitting it.
// ZAA sloped extrusions call this for every segment, but many consecutive
// segments share the same quantized Z — emitting it every time is redundant.
bool z_changed = (GCodeG1Formatter::quantize_xyzf(point(2)) != GCodeG1Formatter::quantize_xyzf(m_pos(2)));
m_pos = point;
m_lifted = 0;
if (!force_no_extrusion)
@@ -920,7 +925,10 @@ std::string GCodeWriter::extrude_to_xyz(const Vec3d &point, double dE, const std
Vec3d point_on_plate = { point(0) - m_x_offset, point(1) - m_y_offset, point(2) };
GCodeG1Formatter w;
w.emit_xyz(point_on_plate);
if (z_changed)
w.emit_xyz(point_on_plate);
else
w.emit_xy(Vec2d(point_on_plate.x(), point_on_plate.y()));
if (!force_no_extrusion)
w.emit_e(filament()->E());
//BBS