Delta Test Cube (Hex Prism)

I got sick of printing test cubes and having them occupy my drawers chaotically. Hexagonal objects are much better for diagnosing dimensional inaccuracies on a Delta printer. The hexagonal prism has the letters X Y Z which stands for the towers of a Delta printer and obviosly not the coordinate system ;).
Between two opposing sides should always be 20mm,the height is 20mm wihtout the thread and 30mm wiht the threaded bolt. Another advantage is that this print is much better stashable since you screw various test objects together. i've added also a thread/screw less version for faster printing