About this 3D model

Designed this coupler for my broken Z-Axis coupler. The 5 mm hole is suitable for NEMA 17 stepper motor shaft and the 1/4 inch is for the ACME threaded rod. Now Version 1.1 includes some minor tweaks such as: 1) A middle notch to improve the clamp flexibility. 2) M3 hex nut cutouts to make tightening the clamps convenient and easy. 3) A dimple on the 5 mm hole for steppers with flattened shafts. (Note: as requested, couplerV1-1_forRoundShaft.stl is for non flattened shafts) Youtube video link: [3D Printing Time lapse, Printrbot Z-axis coupler](http://www.youtube.com/watch?v=GUqaaEBxx_0) Requires 4 pcs of 12 mm long M3 Hex screws and nuts. Print Conditions: Layer height: 0.1 mm Fill: 30% Wall thickness: 1 mm Brim: 20 mm