For more accessibility special with the 3-in 1-out nozzle changed I the horizontal orientation from the original Mendel90 sturdy to a vertical orientation, with a modified and mirrored Prusa Vanilla X-axis for 10mm smooth rods and 50mm spacing.

The left and right z-motor mount of the mendel90 sturdy are swapped and re-used

The X-carriage is a first draft (work in progress) and has for moment 3×2 mounting holes for M3 screws 30mm apart. Bottom (proximity sensor holder), the middle can be used for Prusa i3 mounts as the cooling shield in picture above or a standard Greg’s -Wade’s geared extruder or a modified here.

Over time, there will be more versions of X-carriage added, with something for cable management, a load cell replacing the z-endstop………….

STL M8 threaded rod V0.1(zip-file)
M8 version is already obsolete, M8 threaded rod is no lead screw or guaranteed right but is stiffer than an M5 threaded rod and can give easier a Z-wobble
STL M5 threaded rod V0.1(zip-file)
STL M5 threaded rod with back slash V0.1(zip-file)
STL 12mm and 18 mm proximity sensor holder (zip-file)