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OpenSCAD Parametric CAD Library (LGPL 2.1)
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Latest commit 6079e6d @elmom Merge pull request #13 from traverseda/master
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bitmap Some more potential mistakes and an OpenSCAD syntax error
2Dshapes.scad Added layout and 2D shapes modules
README.markdown clarify that you cannot use wildcards in OpenSCAD use/include statements
TODO Added some items to TODO Add to be able to import the python code also
bearing.scad API change! This actually makes the bearing code usable sice it works…
boxes.scad Added code from the openscad svn repo for easy use and improvement.
constants.scad Clarified the licenses in use in this library, has GPL2 and GPL3 whic…
curves.scad Randome bits of syntax that openscad doesn't treat as errors
gears.scad Fixed some copyright disclaimers
gridbeam.scad added functions and fixes to gridbeam.scad
hardware.scad fixed up license of hardware.scad
involute_gears.scad Randome bits of syntax that openscad doesn't treat as errors
layouts.scad Added layout and 2D shapes modules
lgpl-2.1.txt Changed to LGPL, since all the code is now compatible
libtriangles.scad Added licensing stuff.
materials.scad Added testing infra using py.test. Catches parse errors already, but …
math.scad Clarified the licenses in use in this library, has GPL2 and GPL3 whic…
metric_fastners.scad moved ellipse and egg_outline to regular_shapes.scad
motors.scad Added a tolerance parameter tor motors.scad, by D1plo1d
nuts_and_bolts.scad Fixed some copyright disclaimers Moved testing code to another file for easier using outside MCAD Raised the default timeout for calling openscad to make tests not fail
regular_shapes.scad Made square pyramid actually work
screw.scad auger() actually builds augers with all params
servos.scad Testing improvements and cleanup
shapes.scad Added layout and 2D shapes modules
stepper.scad Randome bits of syntax that openscad doesn't treat as errors
teardrop.scad fixed license and typo for teardrop.scad Improved docs based on failures of Moved testing code to another file for easier using outside MCAD
triangles.scad Merged changes from a fork
units.scad Added a switch to generate bearing outlines for hole cutting etc.
utilities.scad Added a spin module, does what the transformation with the same name …


OpenSCAD MCAD Library

This library contains components commonly used in designing and moching up mechanical designs. It is currently unfinished and you can expect some API changes, however many things are already working.

This library is licensed under the LGPL 2.1 See or the included file, lgpl-2.1.txt.


You can import these files in your scripts with use <MCAD/filename.scad>, where 'filename' is one of the files listed below like 'motors' or 'servos'. Some files include useful constants which will be available with include <MCAD/filename.scad>, which should be safe to use on all included files (ie. no top level code should create geometry). (There is a bug/feature that prevents including constants from files that "include" other files - see the openscad mailing list archives for more details. Since the maintainers aren't very responsive, may have to work around this somehow)

If you host your project in git, you can do git submodule add URL PATH in your repo to import this library as a git submodule for easy usage. Then you need to do a git submodule update --init after cloning. When you want to update the submodule, do cd PATH; git checkout master; git pull. See git help submodule for more info.

Currently Provided Tools:

  • involute_gears.scad (

    • gear()
    • bevel_gear()
    • bevel_gear_pair()
  • gears.scad (Old version):

    • gear(number_of_teeth, circular_pitch OR diametrial_pitch, pressure_angle OPTIONAL, clearance OPTIONAL)
  • motors.scad:

    • stepper_motor_mount(nema_standard, slide_distance OPTIONAL, mochup OPTIONAL)

Other tools (alpha and beta quality):

  • nuts_and_bolts.scad: for creating metric and imperial bolt/nut holes
  • bearing.scad: standard/custom bearings
  • screw.scad: screws and augers
  • materials.scad: color definitions for different materials
  • stepper.scad: NEMA standard stepper outlines
  • servos.scad: servo outlines
  • boxes.scad: box with rounded corners
  • triangles.scad: simple triangles

Very generally useful functions and constants:

  • math.scad: general math functions
  • constants.scad: mathematical constants
  • curves.scad: mathematical functions defining curves
  • units.scad: easy metric units
  • utilities.scad: geometric funtions and misc. useful stuff
  • teardrop.scad ( parametric teardrop module
  • shapes.scad: simple shapes by Catarina Mota

External utils that generate and and process openscad code:

  • testing code, see below
  • code for scraping function names etc.


You are welcome to fork this project in github and request pulls. I will try to accomodate the community as much as possible in this. If for some reason you want collaborator access, just ask.

Github is fun (and easy), but I can include code submissions and other improvements directly, and have already included code from various sources (thingiverse is great :)

Code style

I'd prefer to have all included code nicely indented, at least at the block level, and no extraneous whitespace. I'm used to indent with four spaces as opposed to tabs or other mixes of whitespace, but at least try to choose a style and stick to it.


I've started a minimal testing infrastucture for OpenSCAD code. It's written in python and uses py.test (might be compatible with Nose also). Just type py.test inside the lib dir in a terminal and you should see a part of the tests passing and tracebacks for failing tests. It's very simplistic still, but it should test that no syntax errors occur at least.

The code is included in, and can be imported to be used in other codebases.

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