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So, what's this Slic3r?
Slic3r is mainly a toolpath generator for 3D printers: it reads 3D models (STL, OBJ, AMF, 3MF) and it converts them into G-code instructions for 3D printers. But it does much more than that, see the features list below.
Slic3r was born in 2011 within the RepRap community and thanks to its high configurability became the swiss-army knife for 3D printing. It served as a platform for experimenting several new ideas that later became technology standards, such as multiple extruders, brim, variable-height layers, per-object settings, modifiers, post-processing scripts, G-code macros and more. Despite being based on volunteer efforts, Slic3r is still pushing the boundaries of 3D printing.
- Open: it is totally open source and it's independent from any commercial company or printer manufacturer. We want to keep 3D printing open and free.
- Compatible: it supports all the known G-code dialects (Marlin, Repetier, Mach3, LinuxCNC, Machinekit, Smoothie, Makerware, Sailfish).
- Advanced: many configuration options allow for fine-tuning and full control. While novice users often need just few options, Slic3r is mostly used by advanced users.
- Community-driven: new features or issues are discussed in the GitHub repository. Join our collaborative effort and help improve it!
- Robust: the codebase includes more than 1,000 unit and regression tests, collected in 6 years of development.
- Modular: the core of Slic3r is libslic3r, a C++ library that provides a granular API and reusable components.
- Embeddable: a complete and powerful command line interface allows to use Slic3r from the shell or to integrate it in server-side applications.
- Powerful: see the list below!
See the project homepage at slic3r.org for more information.
(Most of these are also available in the command line interface.)
- G-code generation for FFF/FDM printers;
- conversion between STL, OBJ, AMF, 3MF and POV formats;
- auto-repair of non-manifold meshes (and ability to re-export them);
- SVG export of slices;
- built-in USB/serial host controller, supporting multiple simultaneous printers each one with a spool queue;
- OctoPrint integration (send to printer);
- built-in projector and host for DLP printers;
- tool for cutting meshes in multiple solid parts with visual preview (also in batch using a grid);
- tool for extruding 2.5D TIN meshes.
What language is it written in?
The core parts of Slic3r are written in C++11, with multithreading. The graphical interface is in the process of being ported to C++14.
How to install?
If you want to compile the source yourself follow the instructions on one of these wiki pages:
Can I help?
Sure! You can do the following to find things that are available to help with:
- Contribute to the Manual! (see its GitHub repository)
- You can also find us in #slic3r on FreeNode: talk to Sound, LoH or the other members of the Slic3r community.
- Add an issue to the GitHub tracker if it isn't already present.
- Drop Alessandro a line at firstname.lastname@example.org.
- Drop Joseph a line at email@example.com
package/: the scripts used for packaging the executables
src/: the C++ source of the
slic3rexecutable the and CMake definition file for compiling it
src/GUI: The C++ GUI.
src/test: New test suite for libslic3r and the GUI. Implemented with Catch2
t/: the test suite (deprecated)
utils/: various useful scripts
xs/src/libslic3r/: C++ sources for libslic3r
xs/t/: test suite for libslic3r (deprecated)
xs/xsp/: bindings for calling libslic3r from Perl (XS) (deprecated)
The main author of Slic3r is Alessandro Ranellucci (@alexrj, Sound in IRC, @alranel on Twitter), who started the project in 2011.
Joseph Lenox (@lordofhyphens, LoH in IRC, @LenoxPlay on Twitter) is the current co-maintainer.
Contributions by Henrik Brix Andersen, Vojtech Bubnik, Nicolas Dandrimont, Mark Hindess, Petr Ledvina, Y. Sapir, Mike Sheldrake, Kliment Yanev and numerous others. Original manual by Gary Hodgson. Slic3r logo designed by Corey Daniels, Silk Icon Set designed by Mark James, stl and gcode file icons designed by Akira Yasuda.
How can I invoke Slic3r using the command line?
Usage: slic3r.pl [ OPTIONS ] [ file.stl ] [ file2.stl ] ... --help Output this usage screen and exit --version Output the version of Slic3r and exit --save <file> Save configuration to the specified file --load <file> Load configuration from the specified file. It can be used more than once to load options from multiple files. -o, --output <file> File to output gcode to (by default, the file will be saved into the same directory as the input file using the --output-filename-format to generate the filename.) If a directory is specified for this option, the output will be saved under that directory, and the filename will be generated by --output-filename-format. Non-slicing actions (no G-code will be generated): --repair Repair given STL files and save them as <name>_fixed.obj --cut <z> Cut given input files at given Z (relative) and export them as <name>_upper.stl and <name>_lower.stl --split Split the shells contained in given STL file into several STL files --info Output information about the supplied file(s) and exit -j, --threads <num> Number of threads to use (1+, default: 2) GUI options: --gui Forces the GUI launch instead of command line slicing (if you supply a model file, it will be loaded into the plater) --no-gui Forces the command line slicing instead of gui. This takes precedence over --gui if both are present. --autosave <file> Automatically export current configuration to the specified file Output options: --output-filename-format Output file name format; all config options enclosed in brackets will be replaced by their values, as well as [input_filename_base] and [input_filename] (default: [input_filename_base].gcode) --post-process Generated G-code will be processed with the supplied script; call this more than once to process through multiple scripts. --export-svg Export a SVG file containing slices instead of G-code. -m, --merge If multiple files are supplied, they will be composed into a single print rather than processed individually. Printer options: --bed-shape Coordinates in mm of the bed's points (default: 0x0,200x0,200x200,0x200) --has-heatbed This will provide automatic generation of bed heating gcode --nozzle-diameter Diameter of nozzle in mm (default: 0.5) --print-center Coordinates in mm of the point to center the print around (default: 100,100) --z-offset Additional height in mm to add to vertical coordinates (+/-, default: 0) --gcode-flavor The type of G-code to generate (reprap/teacup/repetier/makerware/sailfish/mach3/machinekit/smoothie/no-extrusion, default: reprap) --use-relative-e-distances Enable this to get relative E values (default: no) --use-firmware-retraction Enable firmware-controlled retraction using G10/G11 (default: no) --use-volumetric-e Express E in cubic millimeters and prepend M200 (default: no) --gcode-arcs Use G2/G3 commands for native arcs (experimental, not supported by all firmwares) --gcode-comments Make G-code verbose by adding comments (default: no) --vibration-limit Limit the frequency of moves on X and Y axes (Hz, set zero to disable; default: 0) --pressure-advance Adjust pressure using the experimental advance algorithm (K constant, set zero to disable; default: 0) Filament options: --filament-diameter Diameter in mm of your raw filament (default: 3) --extrusion-multiplier Change this to alter the amount of plastic extruded. There should be very little need to change this value, which is only useful to compensate for filament packing (default: 1) --temperature Extrusion temperature in degree Celsius, set 0 to disable (default: 200) --first-layer-temperature Extrusion temperature for the first layer, in degree Celsius, set 0 to disable (default: same as --temperature) --bed-temperature Heated bed temperature in degree Celsius, set 0 to disable (default: 0) --first-layer-bed-temperature Heated bed temperature for the first layer, in degree Celsius, set 0 to disable (default: same as --bed-temperature) Speed options: --travel-speed Speed of non-print moves in mm/s (default: 130) --perimeter-speed Speed of print moves for perimeters in mm/s (default: 30) --small-perimeter-speed Speed of print moves for small perimeters in mm/s or % over perimeter speed (default: 30) --external-perimeter-speed Speed of print moves for the external perimeter in mm/s or % over perimeter speed (default: 70%) --infill-speed Speed of print moves in mm/s (default: 60) --solid-infill-speed Speed of print moves for solid surfaces in mm/s or % over infill speed (default: 60) --top-solid-infill-speed Speed of print moves for top surfaces in mm/s or % over solid infill speed (default: 50) --support-material-speed Speed of support material print moves in mm/s (default: 60) --support-material-interface-speed Speed of support material interface print moves in mm/s or % over support material speed (default: 100%) --bridge-speed Speed of bridge print moves in mm/s (default: 60) --gap-fill-speed Speed of gap fill print moves in mm/s (default: 20) --first-layer-speed Speed of print moves for bottom layer, expressed either as an absolute value or as a percentage over normal speeds (default: 30%) Acceleration options: --perimeter-acceleration Overrides firmware's default acceleration for perimeters. (mm/s^2, set zero to disable; default: 0) --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) --first-layer-acceleration Overrides firmware's default acceleration for first layer. (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: 0) Accuracy options: --layer-height Layer height in mm (default: 0.3) --first-layer-height Layer height for first layer (mm or %, default: 0.35) --infill-every-layers Infill every N layers (default: 1) --solid-infill-every-layers Force a solid layer every N layers (default: 0) Print options: --perimeters Number of perimeters/horizontal skins (range: 0+, default: 3) --top-solid-layers Number of solid layers to do for top surfaces (range: 0+, default: 3) --bottom-solid-layers Number of solid layers to do for bottom surfaces (range: 0+, default: 3) --min-shell-thickness Minimum thickness of all solid shells (range: 0+, default: 0) --solid-layers Shortcut for setting the two options above at once --fill-density Infill density (range: 0%-100%, default: 40%) --fill-angle Infill angle in degrees (range: 0-90, default: 45) --fill-pattern Pattern to use to fill non-solid layers (default: honeycomb) --solid-fill-pattern Pattern to use to fill solid layers (default: rectilinear) --start-gcode Load initial G-code from the supplied file. This will overwrite the default command (home all axes [G28]). --end-gcode Load final G-code from the supplied file. This will overwrite the default commands (turn off temperature [M104 S0], home X axis [G28 X], disable motors [M84]). --before-layer-gcode Load before-layer-change G-code from the supplied file (default: nothing). --layer-gcode Load after-layer-change G-code from the supplied file (default: nothing). --toolchange-gcode Load tool-change G-code from the supplied file (default: nothing). --seam-position Position of loop starting points (random/nearest/aligned, default: aligned). --external-perimeters-first Reverse perimeter order. (default: no) --spiral-vase Experimental option to raise Z gradually when printing single-walled vases (default: no) --only-retract-when-crossing-perimeters Disable retraction when travelling between infill paths inside the same island. (default: no) --solid-infill-below-area Force solid infill when a region has a smaller area than this threshold (mm^2, default: 70) --infill-only-where-needed Only infill under ceilings (default: no) --infill-first Make infill before perimeters (default: no) Quality options (slower slicing): --extra-perimeters Add more perimeters when needed (default: yes) --avoid-crossing-perimeters Optimize travel moves so that no perimeters are crossed (default: no) --thin-walls Detect single-width walls (default: yes) --overhangs Experimental option to use bridge flow, speed and fan for overhangs (default: yes) Support material options: --support-material Generate support material for overhangs --support-material-threshold Overhang threshold angle (range: 0-90, set 0 for automatic detection, default: 0) --support-material-pattern Pattern to use for support material (default: honeycomb) --support-material-spacing Spacing between pattern lines (mm, default: 2.5) --support-material-angle Support material angle in degrees (range: 0-90, default: 0) --support-material-contact-distance Vertical distance between object and support material (0+, default: 0.2) --support-material-interface-layers Number of perpendicular layers between support material and object (0+, default: 3) --support-material-interface-spacing Spacing between interface pattern lines (mm, set 0 to get a solid layer, default: 0) --raft-layers Number of layers to raise the printed objects by (range: 0+, default: 0) --support-material-enforce-layers Enforce support material on the specified number of layers from bottom, regardless of --support-material and threshold (0+, default: 0) --dont-support-bridges Experimental option for preventing support material from being generated under bridged areas (default: yes) Retraction options: --retract-length Length of retraction in mm when pausing extrusion (default: 1) --retract-speed Speed for retraction in mm/s (default: 30) --retract-restart-extra Additional amount of filament in mm to push after compensating retraction (default: 0) --retract-before-travel Only retract before travel moves of this length in mm (default: 2) --retract-lift Lift Z by the given distance in mm when retracting (default: 0) --retract-lift-above Only lift Z when above the specified height (default: 0) --retract-lift-below Only lift Z when below the specified height (default: 0) --retract-layer-change Enforce a retraction before each Z move (default: no) --wipe Wipe the nozzle while doing a retraction (default: no) Retraction options for multi-extruder setups: --retract-length-toolchange Length of retraction in mm when disabling tool (default: 10) --retract-restart-extra-toolchange Additional amount of filament in mm to push after switching tool (default: 0) Cooling options: --cooling Enable fan and cooling control --min-fan-speed Minimum fan speed (default: 35%) --max-fan-speed Maximum fan speed (default: 100%) --bridge-fan-speed Fan speed to use when bridging (default: 100%) --fan-below-layer-time Enable fan if layer print time is below this approximate number of seconds (default: 60) --slowdown-below-layer-time Slow down if layer print time is below this approximate number of seconds (default: 30) --min-print-speed Minimum print speed (mm/s, default: 10) --disable-fan-first-layers Disable fan for the first N layers (default: 1) --fan-always-on Keep fan always on at min fan speed, even for layers that don't need cooling Skirt options: --skirts Number of skirts to draw (0+, default: 1) --skirt-distance Distance in mm between innermost skirt and object (default: 6) --skirt-height Height of skirts to draw (expressed in layers, 0+, default: 1) --min-skirt-length Generate no less than the number of loops required to consume this length of filament on the first layer, for each extruder (mm, 0+, default: 0) --brim-width Width of the brim that will get added to each object to help adhesion (mm, default: 0) Transform options: --scale Factor for scaling input object (default: 1) --rotate Rotation angle in degrees (0-360, default: 0) --duplicate Number of items with auto-arrange (1+, default: 1) --duplicate-grid Number of items with grid arrangement (default: 1,1) --duplicate-distance Distance in mm between copies (default: 6) --dont-arrange Don't arrange the objects on the build plate. The model coordinates define the absolute positions on the build plate. The option --print-center will be ignored. --xy-size-compensation Grow/shrink objects by the configured absolute distance (mm, default: 0) Sequential printing options: --complete-objects When printing multiple objects and/or copies, complete each one before starting the next one; watch out for extruder collisions (default: no) --extruder-clearance-radius Radius in mm above which extruder won't collide with anything (default: 20) --extruder-clearance-height Maximum vertical extruder depth; i.e. vertical distance from extruder tip and carriage bottom (default: 20) Miscellaneous options: --notes Notes to be added as comments to the output file --resolution Minimum detail resolution (mm, set zero for full resolution, default: 0) Flow options (advanced): --extrusion-width Set extrusion width manually; it accepts either an absolute value in mm (like 0.65) or a percentage over layer height (like 200%) --first-layer-extrusion-width Set a different extrusion width for first layer --perimeter-extrusion-width Set a different extrusion width for perimeters --external-perimeter-extrusion-width Set a different extrusion width for external perimeters --infill-extrusion-width Set a different extrusion width for infill --solid-infill-extrusion-width Set a different extrusion width for solid infill --top-infill-extrusion-width Set a different extrusion width for top infill --support-material-extrusion-width Set a different extrusion width for support material --infill-overlap Overlap between infill and perimeters (default: 15%) --bridge-flow-ratio Multiplier for extrusion when bridging (> 0, default: 1) Multiple extruder options: --extruder-offset Offset of each extruder, if firmware doesn't handle the displacement (can be specified multiple times, default: 0x0) --perimeter-extruder Extruder to use for perimeters and brim (1+, default: 1) --infill-extruder Extruder to use for infill (1+, default: 1) --solid-infill-extruder Extruder to use for solid infill (1+, default: 1) --support-material-extruder Extruder to use for support material, raft and skirt (1+, default: 1) --support-material-interface-extruder Extruder to use for support material interface (1+, default: 1) --ooze-prevention Drop temperature and park extruders outside a full skirt for automatic wiping (default: no) --ooze-prevention Drop temperature and park extruders outside a full skirt for automatic wiping (default: no) --standby-temperature-delta Temperature difference to be applied when an extruder is not active and --ooze-prevention is enabled (default: -5)
For more information about command line usage see the relevant manual page.