Pen Plotter attachment for CNC chucks

thingiverse

This is an attachment that lets you turn your CNC mill into a pen plotter without any modifications. The attachment has a stalk that the chuck can grip just like a drill bit or endmill. I've included two versions, one with a plastic stalk and one with a hole for a machine screw (#5 diameter, 1.5 inches or longer) in case the plastic stalk is too weak. Instructions I printed this on a Replicator with 20% infill and at a feed rate of 30 (I find the slower feed rate makes slightly longer build times but much more repeatable results). All the other settings were unchanged. Print the part, insert a pen (it should be able to press-fit pretty tightly, but I'm also planning on adding hooks so a rubber band can be used to tension the pen against the paper), re-zero your Z-axis, and start drawing! I designed this to allow clearance between a Dremel flex attachment and the upright pen, but you may need to lengthen the piece in Sketchup if you're using a regular Dremel (alternately, you could find a short pen...). This part is listed as "in progress" because I haven't tested it yet (I'll have to do that when I get back to my mill at home). I expect to update the part with improvements and extra features, but no radical changes.