I created this bowden mount in order to convert my OneUp to a bowden style hotend. It uses my E3D extruder (http://www.thingiverse.com/thing:749998) in a horizontal mounted fashion in combination with the same down at the hotend. Simply print the mount, slide it onto your top rail, and mount your extruder to it. I used about 2 feet of PTFE tubing to connect to my hotend, along with the E3D "groove mount bowden coupler" that they sell on their website. It works really well and allowed me to increase my print speeds pretty dramatically in comparison to the stock hotend configuration.