3-way Trammel of Archimedes

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