Summary

Holds a 10mm Borescope (around $10 on eBay) onto the print bed of a Printrbot Simple. should work with metal as well. Great for monitoring prints in Astroprint!

Instructions

use an extra 20mm M3 hex screw to screw the arm piece into the print bed, replacing the existing screw.
attach the vertical slider using a #6 1-inch screw, washers, and nut.
place a #6 nut into the receptacle on the holder piece, and screw threw into it from the slider piece.
slide the borescope, after moving the front ring, into the holder piece. shim with blue painters tape and cardboard until it fits snuggly

Borescope holder for Printrbot Simple