Calibration Ruler Stand

Hi all,

I designed these stands for the calibration ruler. It allows the ruler to be in a 45 degrees angle and in a 90 degrees angle so that it can ease the calibration procedure.
At the bottom side, i attached a piece of rubber (same as used for chair feet) so that they don't slide over the heatbed.
This calibration ruler is used for the calibration procedure of the steps/mm of the printer.
I have a video explaining the calibration procedure (not using the stands) and it can be found her