Printrbot Z Hack
by bwevans, published
Most will agree that 5/16" galvanized threaded rod is not the best leadscrew for a printer's z-axis yet Printrbots still ship with them. This thing is a bit of a hack to adapt the printer to an M6 threaded rod leadscrew with a pair of captive nuts and a spring. The printed adapter is designed to fit the space occupied by the 5/16" hex nut and require no changes to the printer. This upgrade increases the steps/mm to a nice even 3200 (as opposed to 2267.7183), reduces any sort of backlash, and makes the z axis run smoothly.
Loosely based on some work I was doing with the x-axis ends for the Wallace.
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Hardware needed similar to the following: 18-8 M6 threaded rod http://www.mcmaster.com/#catalog/119/3149/=lskk82 M6 brass hex nuts http://www.mcmaster.com/#catalog/119/3167/=lskic8 (Could also use standard M6 hex nuts but the brass runs infinitely smoother.) 9mm OD 28.5L compression spring http://www.mcmaster.com/#catalog/119/1222/=lskjih Vinyl tubing to attach the rod to z-motor shaft (haven't tested this yet)
Tested and shown on a Printrbot Jr. but may work on other Printrbots.