This model was inspired by this work. Except I wanted it to use the side rails of the rackfinity system as well as have it printable on a Prusa Mini. So I designed my own version that fulfills those requirements.
The back piece contains screw holes where you can use 2x M3x15mm screws to secure the M920 in the contraption.
If you wish you can use 4x M4x15mm screws and nuts to secure the back piece to the main piece. The front panel is also secured with 4x M4x15mm screws and nuts. The back plate is optional but if you do decide to install it you will need 2x M4x20mm screws and nuts.
The 3mf files show print orientations and support/manual brim modifications needed to ensure reliable printing.
Note: you can use your slicer to punch a hole into the bottom of the back piece so that you can do the wiring “within” the rack itself. Useful to make the wires traverse different levels of the rack.
The author remixed this model.
Used one of the 1U units and modified it to fit an M920 snugly.