Bed level jig

Tool for leveling you print bed on a CTC and similar printers. This is inspired by thing 30080 and thing 23257, but these did not fit the magnets I had at hand and only one of them had the source files needed to modify it - and I did not have access to that tool. So here is a version with the OpenJSCAD source file, so you can change it to fit your printer and the magnets you have at hand.

Version 2
Added the ability to set the thickness of the bar to allow calipers with different pin-lengths