About this 3D model

This is a mechanically enhanced version of the great "3-way Trammel of Archimedes" (http://www.thingiverse.com/thing:372237). This version has a longer trammel, with a shape that allows better sliding/movement without lockings or jammings. The base is also provided by a circular support with 6 holes suitable for 4mm MA conical screws. https://www.youtube.com/watch?v=2PR0_HaSQfQ&feature=youtu.be