CoreXY Calibration Ocatagon ("cube")

Now you can check if your belts lengths are correctly tuned and check the quality of the single motor movements!

The parallel faces are all 20mm apart and there is a small chamfer at the base to cut any problems with elephant foot.

###Update 16/05/2018
Uploaded the R1 version of the original with bigger XM and YM letters. Also made an improved version with the square base and the octagon prism at the top!! The Chamfer at the base of the V2 is 0,4mm so leave your first layer height at 0,2m