I edited the SCAD file from openhardwarecoza to work with my Jhead-Lite Hotend from Ohioplastics. The first one I printed didn't have the relief for the idler, so I had to trim it down to fit. It seemed to work well until my Stepper died. I haven't printed this one yet.

Edit: I had it printed at work. I will test for fit tonight.

Edit: 5/15/14 Added a relief for the Strut.
Edit: 5/19/14 Corrected Mistakes