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+OpenSCAD MCAD Library [![](http://stillmaintained.com/user/project.png)](http://stillmaintained.com/user/project)
+=====================
+
+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 http://creativecommons.org/licenses/LGPL/2.1/ or the included file, lgpl-2.1.txt.
+
+## Usage ##
+
+You can import these files in your scripts with "use <MCAD/*.scad>", but some
+files include useful constants which will be available with "include <MCAD/*.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 (http://www.thingiverse.com/thing:3575):
+    - 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 (http://www.thingiverse.com/thing:3457): parametric teardrop module
+* shapes.scad: simple shapes by Catarina Mota
+
+External utils that generate and and process openscad code:
+* openscad_testing.py: testing code, see below
+* openscad_utils.py: code for scraping function names etc.
+
+## Development ##
+
+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.
+
+### Testing ###
+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 openscad_testing.py, and can be imported to be
+used in other codebases.