Custom pulley for an 8mm instead of a standard 6mm shaft to upgrade the stepper motor on the weak 4th axis of a YOOCNC6040 (e.g. carving-cnc) CNC milling machine with a high-torque, longneck one.Blog post:http://marcuswolschon.blogspot.de/2013/06/custom-xl45-pulley-for-8mm-d-shaped.html Why I'm leaving Thingiverse and moving my designs here:http://marcuswolschon.blogspot.de/2014/01/leaving-thingiverse.html