50mm calibration square
thingiverse
It's just a 50mm *square donuts* with a hole of 30mm. Height 10mm.
Download Model from thingiverse
With this file you will be able to print 50mm calibration square with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on 50mm calibration square.