Protractor and 13 cm Metric Ruler The inner notches are spaced 10 degrees and the outer notches 5 degrees. Left a space in the center to customize with your child's name, just print the name at 2.5mm height offset or use Makerbot Desktop to combine the protractor and a name object that is at least 2.5mm high.pause the build at Z=2.6 mm and change filament color to make the text more readable.