This allows you to quickly callibrate your new 3d printer be it reprap, printrbot or whatnot. It's a 2cm cube with a 1cm hole along the x-ax.
Print at 100% is around 10min. It slices really quickly allowing you to do fast iterations.
Once you got the z-ax properly callibrated and your infill etc. You can print at 500% and pause the print after the first perimeter -> it should be exactly 10cm by 10cm then and you can measure + adjust your x and y steps properly.
Anyway it's the fastest way I found to get a printer fully callibrated nicely ;).
Did this in openscad but lost that file ... only uploaded the stl here...Cube callibration test
is licensed under the GNU - GPL
2 w x
2 d x
0.787 w x
0.787 d x