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Added a limit on how many GCode lines pressure equalizer is processing. It reduces pressure equalizer processing time a lot.

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Also, the maximum segment length to split was decreased to make the transition between different flow rates smoother.
This commit is contained in:
Lukáš Hejl 2022-06-17 11:01:59 +02:00
parent 1622208249
commit 3a792738cb
2 changed files with 13 additions and 9 deletions
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20
src/libslic3r/GCode/PressureEqualizer.cpp
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@ -18,6 +18,15 @@ static const std::string EXTRUDE_END_TAG = ";_EXTRUDE_END";
static const std::string EXTRUDE_SET_SPEED_TAG = ";_EXTRUDE_SET_SPEED";
static const std::string EXTERNAL_PERIMETER_TAG = ";_EXTERNAL_PERIMETER";
// Maximum segment length to split a long segment if the initial and the final flow rate differ.
// Smaller value means a smoother transition between two different flow rates.
static constexpr float max_segment_length = 5.f;
// For how many GCode lines back will adjust a flow rate from the latest line.
// Bigger values affect the GCode export speed a lot, and smaller values could
// affect how distant will be propagated a flow rate adjustment.
static constexpr int max_look_back_limit = 128;
PressureEqualizer::PressureEqualizer(const Slic3r::GCodeConfig &config) : m_use_relative_e_distances(config.use_relative_e_distances.value)
{
// Preallocate some data, so that output_buffer.data() will return an empty string.
@ -38,7 +47,6 @@ PressureEqualizer::PressureEqualizer(const Slic3r::GCodeConfig &config) : m_use_
m_filament_crossections.push_back(float(a));
}
m_max_segment_length = 20.f;
// Volumetric rate of a 0.45mm x 0.2mm extrusion at 60mm/s XY movement: 0.45*0.2*60*60=5.4*60 = 324 mm^3/min
// Volumetric rate of a 0.45mm x 0.2mm extrusion at 20mm/s XY movement: 0.45*0.2*20*60=1.8*60 = 108 mm^3/min
// Slope of the volumetric rate, changing from 20mm/s to 60mm/s over 2 seconds: (5.4-1.8)*60*60/2=60*60*1.8 = 6480 mm^3/min^2 = 1.8 mm^3/s^2
@ -380,7 +388,7 @@ void PressureEqualizer::output_gcode_line(GCodeLine &line)
// Emit the line with lowered extrusion rates.
float l = line.dist_xyz();
if (auto nSegments = size_t(ceil(l / m_max_segment_length)); nSegments == 1) { // Just update this segment.
if (auto nSegments = size_t(ceil(l / max_segment_length)); nSegments == 1) { // Just update this segment.
push_line_to_output(line, line.feedrate() * line.volumetric_correction_avg(), comment);
} else {
bool accelerating = line.volumetric_extrusion_rate_start < line.volumetric_extrusion_rate_end;
@ -403,11 +411,11 @@ void PressureEqualizer::output_gcode_line(GCodeLine &line)
// One may achieve higher print speeds if part of the segment is not speed limited.
l_acc = t_acc * feed_avg;
l_steady = l - l_acc;
if (l_steady < 0.5f * m_max_segment_length) {
if (l_steady < 0.5f * max_segment_length) {
l_acc = l;
l_steady = 0.f;
} else
nSegments = size_t(ceil(l_acc / m_max_segment_length));
nSegments = size_t(ceil(l_acc / max_segment_length));
}
float pos_start[5];
float pos_end[5];
@ -477,10 +485,8 @@ void PressureEqualizer::adjust_volumetric_rate()
return;
// Go back from the current circular_buffer_pos and lower the feedtrate to decrease the slope of the extrusion rate changes.
// size_t fist_line_idx = size_t(std::max<int>(0, int(m_gcode_lines.size()) - 100));
size_t fist_line_idx = 0;
size_t fist_line_idx = size_t(std::max<int>(0, int(m_gcode_lines.size()) - max_look_back_limit));
const size_t last_line_idx = m_gcode_lines.size() - 1;
size_t line_idx = last_line_idx;
if (line_idx == fist_line_idx || !m_gcode_lines[line_idx].extruding())
// Nothing to do, the last move is not extruding.

2
src/libslic3r/GCode/PressureEqualizer.hpp
View file

@ -68,8 +68,6 @@ private:
ExtrusionRateSlope m_max_volumetric_extrusion_rate_slopes[erCount];
float m_max_volumetric_extrusion_rate_slope_positive;
float m_max_volumetric_extrusion_rate_slope_negative;
// Maximum segment length to split a long segment, if the initial and the final flow rate differ.
float m_max_segment_length;
// Configuration extracted from config.
// Area of the crossestion of each filament. Necessary to calculate the volumetric flow rate.