Just a remix of Rcaslis QUBD OneUp/TwoUp extruder bearing holder thing 408818. Mushed version of Tech2C's E3D v6 Bowden X-carriage mount Prusa i3, now for the QUBD OneUp. ;-)
The left gantry mod is a remix from Stefan Burger. Other than the obvious I made the screw holes for the heads just a bit larger as I screwed my first one up trying to drill them out and went too far. Stefan did all the work, I just tweaked it to fit my needs.
My X-Gantry replacement left and right sides didn't match up quite right with the replacement carriage, it was about 1mm too large putting too much pressure on my bearings making them glide horribly. This remix removed that 1mm so it should be smoother. You can edit it to match yours pretty easily, just grab it off my Tinkercad account, also express405. I then noticed that the left side of the X-Gantry takes up more space than the original setup so I sliced the carriage rather than the beefy left side, using the bouden extruder so I'm not too concerned with the narrower bearings. I've even placed the holes on the carriage to match up with the Bowden mount. The Bowden mount was too long so I shortened it a bit to fit the OneUp printing area. Now it is just too high, definitely a work in progress.