MPCNC pen holder for sharpie holder

thingiverse

For my MPCNC, I built a Sharpie pen holder that was designed by someone else (thing:1133425). It works amazingly well but the Sharpies themselves leave a pretty thick line, so I created a subcaliber insert to hold an 0.7 Papermate pen instead of the original 1.0 pen size. This way, I get the best of both worlds now. There are both single and two-piece versions available, depending on your printer's maximum height. Simply glue the two pieces together with crazy glue once they're printed. A spring goes inside first to help maintain even down pressure at all times.