scratch pen holder

thingiverse

A pen holder with ball bearings is used for scratching printed circuit boards (PCBs) to create layouts before etching. This technique has been explained by someone else at http://reprap.org/wiki/Scratch_n%27_Etch_PCBs. I have already printed the required parts, but due to a disrupted print, the tube is shorter and the plate's alignment is not perfect. To ensure proper results, print the tube once and the plate twice.