New --bridge-acceleration option

README.markdown

@@ -163,6 +163,9 @@ The author of the Silk icon set is Mark James.
         --infill-acceleration
                             Overrides firmware's default acceleration for infill. (mm/s^2, set zero
                             to disable; default: 0)
+        --bridge-acceleration
+                            Overrides firmware's default acceleration for bridges. (mm/s^2, set zero
+                            to disable; default: 0)
         --default-acceleration
                             Acceleration will be reset to this value after the specific settings above
                             have been applied. (mm/s^2, set zero to disable; default: 130)

lib/Slic3r/Config.pm

@@ -343,6 +343,14 @@ our $Options = {
         type    => 'f',
         default => 0,
     },
+    'bridge_acceleration' => {
+        label   => 'Bridge',
+        tooltip => 'This is the acceleration your printer will use for bridges. Set zero to disable acceleration control for bridges.',
+        sidetext => 'mm/s²',
+        cli     => 'bridge-acceleration=f',
+        type    => 'f',
+        default => 0,
+    },
     
     # accuracy options
     'layer_height' => {

lib/Slic3r/GCode.pm

@@ -199,10 +199,13 @@ sub extrude_path {
     
     # adjust acceleration
     my $acceleration;
-    $acceleration = $Slic3r::Config->perimeter_acceleration
-        if $Slic3r::Config->perimeter_acceleration && $path->is_perimeter;
-    $acceleration = $Slic3r::Config->infill_acceleration
-        if $Slic3r::Config->infill_acceleration && $path->is_fill;
+    if ($Slic3r::Config->perimeter_acceleration && $path->is_perimeter) {
+        $acceleration = $Slic3r::Config->perimeter_acceleration;
+    } elsif ($Slic3r::Config->infill_acceleration && $path->is_fill) {
+        $acceleration = $Slic3r::Config->infill_acceleration;
+    } elsif ($Slic3r::Config->infill_acceleration && $path->role == EXTR_ROLE_BRIDGE) {
+        $acceleration = $Slic3r::Config->bridge_acceleration;
+    }
     $gcode .= $self->set_acceleration($acceleration) if $acceleration;
     
     my $area;  # mm^3 of extrudate per mm of tool movement 

lib/Slic3r/GUI/Tab.pm

@@ -438,7 +438,7 @@ sub build {
         },
         {
             title => 'Acceleration control (advanced)',
-            options => [qw(perimeter_acceleration infill_acceleration default_acceleration)],
+            options => [qw(perimeter_acceleration infill_acceleration bridge_acceleration default_acceleration)],
         },
     ]);
     

slic3r.pl

@@ -216,6 +216,9 @@ $j
     --infill-acceleration
                         Overrides firmware's default acceleration for infill. (mm/s^2, set zero
                         to disable; default: $config->{infill_acceleration})
+    --bridge-acceleration
+                        Overrides firmware's default acceleration for bridges. (mm/s^2, set zero
+                        to disable; default: $config->{bridge_acceleration})
     --default-acceleration
                         Acceleration will be reset to this value after the specific settings above
                         have been applied. (mm/s^2, set zero to disable; default: $config->{travel_speed})