Polydron Frameworks Collection

Polydron Frameworks is an open-frame version of the marvellous **Original Polydron** educational toy, and the types are compatible. After succeeding in creating [custom pieces of the original](https://www.printables.com/model/1064341-polydron-panels-party), the next logical step was to tackle **Polydron Frameworks**. The only guidelines that were available were the compatibility claim, as well as pictures on the web, which show that the mechanism differs from the original.
So, after a few iterations, we have here a collection of pieces similar to the Polydron range, with some additions:

1. Equilateral n-gons, from 3 to 10 (i.e. triangle to decagon). The decagon comes out at 222mm x **216.36**mm, which means that strictly speaking I am not supposed to be able to print it on my Prusa Mk4, where the Y-size is limited to **210**mm. However, one can get ahead by cheating and lying - it turns out that you can push the Y-size to 216.5mm by setting the bed size accordingly in Prusaslicer, wi