Command line options to assign perimeters and infill to different extruders

slic3r.pl

@@ -285,6 +285,13 @@ $j
     --support-material-extrusion-width
                         Set a different extrusion width for support material
     --bridge-flow-ratio Multiplier for extrusion when bridging (> 0, default: $Slic3r::bridge_flow_ratio)
+  
+   Multiple extruder options:
+    --perimeters-extruder
+                        Extruder to use for perimeters (1+, default: 1)
+    --infill-extruder   Extruder to use for infill (1+, default: 1)
+    --support-material-extruder
+                        Extruder to use for support material (1+, default: 1)
     
 EOF
     exit ($exit_code || 0);