I started off with this model from thingiverse but since I'm mostly printing with PLA it was too wobbly compared to the original metal mount. I also suspect that PLA will isolate heat rather than help dissipate it like the metal mount would, so I tried to cover as little as possible of the drives while adding as much support as possible. Printing this model in PETG would probably be ideal, but it feels sturdy enough even in PLA. Source code in JsCAD is located here if you wan't to build off of this or have suggestions for change.
The author marked this model as their own original creation.