I really like Greg Frost's most recent x-carriage but I had a couple ideas that I thought might make it more accessible.
1) Added back the other two pairs of mounting holes found on the Prusa sled.
2) Moved the belt clamps in so as to not block the zip-tie slots.
3) Added a bit more width to the belt clamp slots to accommodate slightly wider belts.
4) Made the M3 hole in the tensioning stud a bit tighter & deeper.