I have made a tiny improvement which previously, due to laziness, I had not done yet. Originally, the grub screws that held the motors in place simply threaded into a plastic hole. This was a problem as they could not be screwed in tight without slipping, and then the motor would not be clamped down properly. I added space for some simple M3 nuts, which should mean the screws will screw in much better now.

I have not tested this yet, but it should be a-okay. The 3D models are now updated with this change!