Improved version here: https://www.printables.com/model/203584-prusa-i3-mk3s-frame-brace-v2
These are mounts that allow you to strengthen your Prusa i3 MK3S(+) frame with some 13x1mm aluminium rod (325mm length, 2 pieces), after the removal of the PSU and Einsy case.
You'll need regular T-slot nuts, to mount the extrusion mounts (4 nuts in total). These can be bought or printed. Furthermore, you'll need some M3 nuts and M3x20 bolts to mount all the components together.
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The author marked this model as their own original creation.