4B. Upgrading the Nextruder (MMU3)
72 Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade
STEP 5 Removing the print fan assembly
Remove the M3x40 screw from the fan-door hinge.
Pull the print fan assembly from the Nextruder.
Remove all the cables from the cable channel.
STEP 6 Removing the heatsink fan&hotend
Release two M3x20 screws securing the heatsink fan and remove the fan from the
Nextruder.
Loosen both thumb screws.
Pull out the hotend assembly from the Nextruder.
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