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G-code generator for 3D printers (RepRap, Makerbot, Ultimaker etc.)

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Q: Oh cool, a new RepRap slicer?

A: Yes.


What's it?

Slic3r is an STL-to-GCODE translator for RepRap 3D printers, like Enrique's Skeinforge or RevK's E3D.

See the project homepage at for more information.

Why a new one? Why Perl?

The purpose is to build something more maintainable and flexible than both Skeinforge and E3D. The code makes extensive use of object-oriented programming to achieve some level of abstraction instead of working with raw geometry and low-level data structures. This should help to maintain code, fix bugs and implement new and better algorithms in the future. I also aim at implementing better support for hollow objects, as Skeinforge isn't smart enough to generate internal support structures for horizontal facets.


What's its current status?

Slic3r current features are:

  • multi-platform (Linux/Mac/Win);
  • easy configuration/calibration;
  • read binary and ASCII STL files;
  • generate multiple perimeters (skins);
  • generate rectilinear fill;
  • set 0% - 100% infill density;
  • set infill angle;
  • retraction;
  • skirt (with rounded corners);
  • use relative or absolute extrusion commands;
  • high-res perimeters (like the "Skin" plugin for Skeinforge);
  • detect optimal infill direction for bridges;
  • save configuration profiles;
  • center print around bed center point;
  • multiple solid layers near horizontal external surfaces;
  • ability to scale, rotate and multiply input object;
  • use different speed for bottom layer and perimeters.

Roadmap includes the following goals:

  • output some statistics;
  • allow the user to customize initial and final GCODE commands;
  • support material for internal perimeters;
  • cool;
  • other fill patterns.

Is it usable already?


How to install?

It's very easy. See the project homepage for instructions and links to the precompiled packages.

Can I help?

Sure! Send patches and/or drop me a line at You can also find me in #reprap on FreeNode with the nickname Sound.

What's Slic3r license?

Slic3r is dual-licensed under the Perl Artistic License and the AGPLv3. The author is Alessandro Ranellucci (me).

How can I invoke using the command line?

Usage: [ OPTIONS ] file.stl

    --help              Output this usage screen and exit
    --save <file>       Save configuration to the specified file
    --load <file>       Load configuration from the specified file

  Printer options:
    --nozzle-diameter   Diameter of nozzle in mm (default: 0.55)
    --print-center      Coordinates of the point to center the print around 
                        (default: 100,100)
                        Use relative distances for extrusion in GCODE output
    --z-offset          Additional height in mm to add to vertical coordinates
                        (+/-, default: 0)

  Filament options:
    --filament-diameter Diameter of your raw filament (default: 3)
                        Ratio of the extruded volume over volume pushed 
                        into the extruder (default: 0.85)

  Speed options:
    --print-feed-rate   Speed of print moves in mm/sec (default: 60)
    --travel-feed-rate  Speed of non-print moves in mm/sec (default: 130)
                        Speed of print moves for perimeters in mm/sec (default: 60)
                        Factor to increase/decrease speeds on bottom 
                        layer by (default: 0.3)

  Accuracy options:
    --layer-height      Layer height in mm (default: 0.4)

  Print options:
    --perimeters        Number of perimeters/horizontal skins (range: 1+, 
                        default: 3)
    --solid-layers      Number of solid layers to do for top/bottom surfaces
                        (range: 1+, default: 3)
    --fill-density      Infill density (range: 0-1, default: 0.4)
    --fill-angle        Infill angle in degrees (range: 0-90, default: 0)
    --temperature       Extrusion temperature (default: 200)

  Retraction options:
    --retract-length    Length of retraction in mm when pausing extrusion 
                        (default: 1)
    --retract-speed     Speed for retraction in mm/sec (default: 40)
                        Additional amount of filament in mm to push after
                        compensating retraction (default: 0)
                        Only retract before travel moves of this length (default: 1)

   Skirt options:
    --skirts            Number of skirts to draw (default: 1)
    --skirt-distance    Distance in mm between innermost skirt and object 
                        (default: 6)
    -o, --output        File to output gcode to (default: <inputfile>.gcode)

   Transform options:
    --scale             Factor for scaling input object (default: 1)
    --rotate            Rotation angle in degrees (0-360, default: 0)
    --multiply-x        Number of items along X axis (1+, default: 1)
    --multiply-y        Number of items along Y axis (1+, default: 1)
    --multiply-distance Distance in mm between copies (default: 6)
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