scratch pen holder
by CommanderGir, published
Ball bearing supported pen holder to scratch pcb.
The Idea is to scratch a layout on a coated pcb and etch afterwards. It is described by some other guy already http://reprap.org/wiki/Scratch_n%27_Etch_PCBs. I have printed it but not jet tried to use it. Since the print was disrupted the tube in the image is a bit shorter and the Plate on the end is not perfect aligned.
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print tube once and plate twice.