Printrbot Jr Micro Bed level knob

Remixed to make it as small as possible. Scaled to fit the 7.84 mm nuts that came standard with the Printrbot Jr for bed leveling. I am replacing my bed with a piece of glass as well as rebuilding the bed levels to allow adjustment with just the knob. This means I want a very small footprint for the knob to maximize my build area.

Thanks to markbrannan for the original mesh, I scaled it down a bit for this.