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# A pure perl (no C++ implementation) G-code filter, to control the pressure inside the nozzle.
package Slic3r::GCode::PressureRegulator;
use Moo;
has 'config' => (is => 'ro', required => 1);
has 'enable' => (is => 'rw', default => sub { 0 });
has 'reader' => (is => 'ro', default => sub { Slic3r::GCode::Reader->new });
has '_extrusion_axis' => (is => 'rw', default => sub { "E" });
has '_tool' => (is => 'rw', default => sub { 0 });
has '_last_print_F' => (is => 'rw', default => sub { 0 });
has '_advance' => (is => 'rw', default => sub { 0 }); # extra E injected
use Slic3r::Geometry qw(epsilon);
# Acknowledgements:
# The advance algorithm was proposed by Matthew Roberts.
# The initial work on this Slic3r feature was done by Luís Andrade (lluis)
sub BUILD {
my ($self) = @_;
$self->reader->apply_print_config($self->config);
$self->_extrusion_axis($self->config->get_extrusion_axis);
}
sub process {
my $self = shift;
my ($gcode, $flush) = @_;
my $new_gcode = "";
$self->reader->parse($gcode, sub {
my ($reader, $cmd, $args, $info) = @_;
if ($cmd =~ /^T(\d+)/) {
$self->_tool($1);
} elsif ($info->{extruding} && $info->{dist_XY} > 0) {
# This is a print move.
my $F = $args->{F} // $reader->F;
if ($F != $self->_last_print_F) {
# We are setting a (potentially) new speed, so we calculate the new advance amount.
# First calculate relative flow rate (mm of filament over mm of travel)
my $rel_flow_rate = $info->{dist_E} / $info->{dist_XY};
# Then calculate absolute flow rate (mm/sec of feedstock)
my $flow_rate = $rel_flow_rate * $F / 60;
# And finally calculate advance by using the user-configured K factor.
my $new_advance = $self->config->pressure_advance * ($flow_rate**2);
if (abs($new_advance - $self->_advance) > 1E-5) {
my $new_E = ($self->config->use_relative_e_distances ? 0 : $reader->E) + ($new_advance - $self->_advance);
$new_gcode .= sprintf "G1 %s%.5f F%.3f ; pressure advance\n",
$self->_extrusion_axis, $new_E, $self->_unretract_speed;
$new_gcode .= sprintf "G92 %s%.5f ; restore E\n", $self->_extrusion_axis, $reader->E
if !$self->config->use_relative_e_distances;
$self->_advance($new_advance);
}
$self->_last_print_F($F);
}
} elsif (($info->{retracting} || $cmd eq 'G10') && $self->_advance != 0) {
# We need to bring pressure to zero when retracting.
$new_gcode .= $self->_discharge($args->{F});
}
$new_gcode .= "$info->{raw}\n";
});
if ($flush) {
$new_gcode .= $self->_discharge;
}
return $new_gcode;
}
sub _discharge {
my ($self, $F) = @_;
my $new_E = ($self->config->use_relative_e_distances ? 0 : $self->reader->E) - $self->_advance;
my $gcode = sprintf "G1 %s%.5f F%.3f ; pressure discharge\n",
$self->_extrusion_axis, $new_E, $F // $self->_unretract_speed;
$gcode .= sprintf "G92 %s%.5f ; restore E\n", $self->_extrusion_axis, $self->reader->E
if !$self->config->use_relative_e_distances;
$self->_advance(0);
return $gcode;
}
sub _unretract_speed {
my ($self) = @_;
return $self->config->get_at('retract_speed', $self->_tool) * 60;
}
1;
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