Self-centering tapered-thread Z-axis coupling [v2] by loco

This is a remake of my self-centering z-coupler (http://www.thingiverse.com/thing:396781) The thread is now optimized for 3D printing and the overall length is way smaller. It's also a parametric design, so i can easily generate different sizes. I made 4 different sizes for 5mm motor shaft and 5, 6, 8 or 10mm threaded rod. You can just ask me, if you need different sizes. 12/24/14: Added coupler_5_12, coupler_6_12 and nut_12 10/17/15: Added [V2.5] coupler 6.35/8mm + nuts 12/16/15: Added [V2.5] coupler 5/3, 5/4, 5/7 + nuts 02/04/16: Added [V2.5] coupler 5/6.35 03/12/16: Added [V2.5] coupler 5/5 05/26/16: Added [V2.5] coupler 5/8

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