This is a hot-end carriage to make the bowden tube E3D hot-end V5 ( http://e3d-online.com/ ) compatible with the Felix 3D printer (1.5 and up). It's designed for the felix Printer, but can easily be adjusted for other printers as well. Just fit it with two bolds against the rails. I'ts specifically design for the V5 version, The v4 will not fit. The cool ribs are printed inside the PLA clamp. If you need a V6 version: http://www.thingiverse.com/thing:484581 It uses 40mm fans (not the E3D supplied 30mm fan) More cooling, less noise. (and comes standard with the felix printer) This is a two part design. The other part is the Bowden feeder: http://www.thingiverse.com/thing:159159 Here's a instructional video of the carriage and bowden feeder in use: http://www.youtube.com/watch?v=ZsNm0UfQsyQ Special thanks to Guillaume from Felix printers to supply the rail-base. If you use it, please share a picture!Print without support. Use M4 bolds and nuts to fit together.