4. Upgrading the Nextruder
Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade 41
STEP 1 MK4S MMU3
If you have used MMU3 unit on your MK4/MK3.9 printer, your extruder is slightly
different. In that case, please proceed to the dedicated chapter:
4B Upgrading the nextruder MMU3
If you have a single-material printer, continue to the next step.
STEP 2 Tools necessary for this chapter
For this chapter, please prepare:
2.5mm Allen key
Torx key T6
Torx key T10/8
Wrench 13-16
Universal wrench
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