This is a modified x-carriage for the Reprrappro Tricolour Mendel. It is 3mm wider to be compatible with the hotends from Tech3D, and of course the one from Reprappro (but it could also help in case you build your own hotend and your heatsink is a little bigger than the on from Reprappro). It has a different belt-clamping system, which uses printed clamps with GT2-belt-grooves, which are screwed onto the main part.
Credits go to: -The Reprappro Team for the original design - twisterss for giving me the idea of the belt clamp system (my files are not based on his files, though) - tech3d for the wider nozzle holder parts
P.S.: I'm new to the whole licensing part, i hope everything is in order, please write if it is not!