Printed on and for my MPSM V2 this extruder base, arm, and 00mm cap. Fits perfectly without any modification. I did damage the stock extruder arm while removing the bearing. The plastic bearing shaft sheared off of the arm base while I was removing the tightly fit bearing.
Addt'l parts used:
Hobbyking 1kg standard (China) PLA
Filament: Hobbyking standard PLA 1kg dark pink @ 200C/55C
Cura settings: 0.175 mm layer, 20% infill tri-hexagon, 40mm/s speed, raft