Robo3D Z-Axis Auto-Level Nut Adapter - 11mm Wrench to 13mm Wrench

*Quick note, the strange bridges seen in the center cutout sections shouldn't be there, but they also do not print out, so not a problem. Seems to be some error in reading the .obj file, assuming something to do with the boolean used in 3ds max for cutout*
This is a small cap for the couplers used in Mike Kelly's Robo3D Auto-Level Mod (http://www.thingiverse.com/thing:349935).
I had issues where the only coupler I could find to fit my 5/16 threaded rod had outer dimensions to fit an 11mm wr