Summary 30 teeth MXL plotter pulley for drive any 3D printer with low cost plotter pulleys 8€/4meters Instructions print at 0.15mm layer height and 90%infill, in the drowing i have considerate the melt plastic distortions, i have printed 3 at time because i dont usa fan, and work perfectly :) the MXL_pulley 2 have the distance between teeth 0.3mm down if you have problem with v1 try print v2 i have added a belt splitter too, if you dont like 10mm belt you can split into 7mm belt, just print the belt splitter(print 2 parts) , couple it and fit the belt into it, then insert a sharp, i have leaved 3 spaces for 5mm, 7mm and 9mm large belt. you can use these 3 meters belt: http://goo.gl/yhyfp only 8€ :) mission done :P