estep Calibration Tool

I created a easy measuring stick for use with estep calibration for 3D printers. I have a hard time getting my ruler and calipers in my enclosure, so this just is a nice compact tool.

Two designs. One with just a 100mm stick. Then another with a mark at 100mm, and then the stick is 120mm in total.

On my printer, this came out exactly correctly sized. You should measure this prior to using, and adjust the scale if needed.