Printrbot Plus V2 Z-axis nut holder
thingiverse
If you run the printrbot stock out of the box the Z-axis nut can slip out, and you will lose your z-axis calibration, and unlevel your print head relative to the bed. This little part loosely holds the bottom of your nut so the axis won't pop off. Simple fix. Nothing fancy, just a simple part to improve my machine, and I'd thought I'd share.
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