Parametric Pulley Library - Retainer improved

thingiverse

This is a remix of [TNS](https://www.thingiverse.com/TNS) [remix](https://www.thingiverse.com/thing:2136539) of [droftarts](https://www.thingiverse.com/droftarts) [thing](https://www.thingiverse.com/thing:16627) Be cautious, this will only take effect if the pulleys diameter is smaller than the bases diameter. The pink pulley in the first picture, for instance, will be drawn in the conventional way. I enhanced the generation of the belt retainer. The chamfer for the transition from the teeth to the retainer gets a fixed angle of 45 degrees, which is better for printing without support. If the resulting diameter of the retainer from this process is smaller than the bases diameter, the generation will be done like in the original script. However, if the diameter turns out to be larger, the chamfer stops at the bases diameter and the edge continues vertically from there. See the attached picture as an example for this case. I also made the precision for circle generation customizable, since the original value was a bit rough. For detailed information on usage, please refer to the remix sources. I'm not too confident in SCAD, so if you can optimize something in my code, your hints will be greatly appreciated. Edit 2019/05/20: I attached V2.1 with a bug fix for the selection of retainer-generation type. Edit 2019/05/21: I included a hint from beikeland regarding a pulley diameter greater than base diameter.