TBS Source One v0.2 - 5" Arm Protection (2 versions)

thingiverse

This design features a distinctive lip that effectively keeps dirt out of the motor. A 28mm diameter motor bell was utilized. To install, simply push it into place firmly - it shouldn't be too difficult and will fit snugly after that. Alternatively, you can scale it up by 1 or 2% using your slicer software if needed for a tighter fit. Let me know what you think of this design!