I don't like using zip ties as structural components, so I made some LM8UU clamps. They require 2 10mm M3 screws, and two m3 nuts. If you use the nut trap, you can install 'em without using a wrench :-) installation vid: http://berthareprap.blogspot.com/2014/05/prusa-i3-graber-edition-mounting-axes.htmlPrint one clamp and one nut trap. Use relatively fine layers, as they are delicate parts - I couldn't make 'em too big. Press nuts into nut trap, add your LM8uu and screw 'em in!