Snow flake X, Y and Skew setup tool

E-step adjustment tool. 

After replacing belts on my machine I was having issues with parts fitting together. A standard calibration piece showed no issues. It wasn't until I made this tool that I found out my carriage was out of square. This tool has your standard X and Y axis tests as well as 45 degree skew tests.
If you notice parts no longer looking square this tool can help you determine why. Depending on your machine, you can adjust the X and Y e-steps M92, enter a skew correction factor M852, or you can manually realign the gantry to bring everything back to square. 

Outside spokes should measure 100mm, edge to edge, for the X, Y, and Skew tests.
There is also a secondary skew test, measuring 70mm at 45 degree.
Last but not least there is a centering test for X and Y axis. This is measured from the end spoke to edge of the center square. This measurement should be 45mm. This is a good test for the motion system.


Optional X, Y, and Z test piece