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by chowderhead, published
After much wringing of hands and banging of head I decided to assemble useful calculations for gear design into one script. All of this is based upon http://www.thingiverse.com/thing:3575 and includes the spur gear fitting function from http://www.thingiverse.com/thing:6894.
If you want to do fancy things with useful gears in OpenSCAD, use this and have fun.