This is a remixed version of http://www.thingiverse.com/thing:725082 we adapt to our metallic x-carriage in our Prusa i3 PSIQUE kits. We have two versions, for 3mm and 1.75mm, both of them for E3D V6 hotend (original). 1.75mm version is being adapted to the use of PTFE tube, so you can mount your E3D with the PTFE tube without problems (is a work in progress, we're testing now this one). Visit us in http://www.createc3d.com or http://createc3d.com/shop