5/16in to 5mm Printed Z-axis Coupler, Slip-on and Low-profile by 4volt

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I designed this thing to replace the vinyl tubing coupler that comes with the Printrbot Simple, I was able to reduce my wobble by quite a lot.

Here is a sample video: http://www.youtube.com/watch?v=PXRKspDVld0

Printing Instructions
Print and assemble, the coupler should be tight enough to be snug, but not so tight that you can’t get the 5mm motor shaft or the 5/16in threaded rod in all the way. If you force it tooooo much the coupler could get out of alignment.

If the fit is too tight or too loose try printing at a few percent larger or smaller.

Printing Stats
Z_Coupler_v7.STL Time: 0h 30m 30s Filament used: 0.386007m
Z_Coupler_v7_rotated.STL Time: 0h 36m 1s Filament used: 0.389781m
Z_Coupler_v7_for_m6_rotated.STL Time: 0h 36m 55s Filament used: 0.408422m
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