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OpenSCAD Parametric CAD Library (LGPL 2.1)

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Octocat-spinner-32 SolidPython @ ecf1c08 Added the Python solid cad frontend SolidPython as a submodule
Octocat-spinner-32 ThingDoc @ 54c83e5 Updated ThingDoc
Octocat-spinner-32 bitmap Some more potential mistakes and an OpenSCAD syntax error
Octocat-spinner-32 .gitmodules Added ThingDoc as a submodule
Octocat-spinner-32 2Dshapes.scad Added layout and 2D shapes modules
Octocat-spinner-32 3d_triangle.scad minor fix: Use correct use convention in documentation
Octocat-spinner-32 README.markdown Merge from elmom/MCAD
Octocat-spinner-32 TODO Added items to TODO
Octocat-spinner-32 Add to be able to import the python code also
Octocat-spinner-32 bearing.scad API change! This actually makes the bearing code usable sice it works…
Octocat-spinner-32 boxes.scad Added code from the openscad svn repo for easy use and improvement.
Octocat-spinner-32 constants.scad Clarified the licenses in use in this library, has GPL2 and GPL3 whic…
Octocat-spinner-32 curves.scad Randome bits of syntax that openscad doesn't treat as errors
Octocat-spinner-32 fonts.scad Added outline_2d() and bold_2d()
Octocat-spinner-32 gears.scad Fixed some copyright disclaimers
Octocat-spinner-32 Added a simple script that updates the submodules
Octocat-spinner-32 gridbeam.scad remove executable bit and add todo list item
Octocat-spinner-32 hardware.scad fixed up license of hardware.scad
Octocat-spinner-32 involute_gears.scad Fixed orientation issue
Octocat-spinner-32 layouts.scad Added layout and 2D shapes modules
Octocat-spinner-32 lego_compatibility.scad Make underside of block level
Octocat-spinner-32 lgpl-2.1.txt Changed to LGPL, since all the code is now compatible
Octocat-spinner-32 libtriangles.scad Added licensing stuff.
Octocat-spinner-32 materials.scad Added testing infra using py.test. Catches parse errors already, but …
Octocat-spinner-32 math.scad Clarified the licenses in use in this library, has GPL2 and GPL3 whic…
Octocat-spinner-32 metric_fastners.scad moved ellipse and egg_outline to regular_shapes.scad
Octocat-spinner-32 motors.scad Added a tolerance parameter tor motors.scad, by D1plo1d
Octocat-spinner-32 multiply.scad Added multiply.scad
Octocat-spinner-32 nuts_and_bolts.scad Fixed some copyright disclaimers
Octocat-spinner-32 Better test names, support for Mac
Octocat-spinner-32 Better test names, support for Mac
Octocat-spinner-32 polyholes.scad Added license info from
Octocat-spinner-32 regular_shapes.scad Added 2d ring
Octocat-spinner-32 screw.scad auger() actually builds augers with all params
Octocat-spinner-32 servos.scad Testing improvements and cleanup
Octocat-spinner-32 shapes.scad Added layout and 2D shapes modules
Octocat-spinner-32 stepper.scad Randome bits of syntax that openscad doesn't treat as errors
Octocat-spinner-32 teardrop.scad Merge from elmom/MCAD
Octocat-spinner-32 Better test names, support for Mac
Octocat-spinner-32 Moved testing code to another file for easier using outside MCAD
Octocat-spinner-32 transformations.scad Added license, renamed module to make it actually work
Octocat-spinner-32 triangles.scad Minor translation to make the result manifold
Octocat-spinner-32 trochoids.scad Added trochoids.scad from thingiverse, needs cleaning
Octocat-spinner-32 units.scad Added multiply.scad
Octocat-spinner-32 unregular_shapes.scad Added new file for not-so-regular shapes
Octocat-spinner-32 utilities.scad Added multiply.scad

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. "./" is shortcut that initializes and updates submodules.

Currently Provided Tools:

  • regular_shapes.scad

    • regular polygons, ie. 2D
    • regular polyhedrons, ie. 3D
  • 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
  • 3d_triangle.scad: more advanced 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: DEPRECATED simple shapes by Catarina Mota
  • polyholes.scad: holes that should come out well when printed

External utils that generate and and process openscad code:

  • testing code, see below
  • code for scraping function names etc.
  • SolidPython: An external Python library for solid cad


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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