4B. Upgrading the Nextruder (MMU3)
Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade 85
STEP 29 Attaching the Fan-door-cover
Attach the Fan-door-cover hinge to its counterpart in the X-carriage. Holes in both
parts must be aligned.
Insert the M3x30 screw in the hinge on the fan-door. Fully tighten the screw, then
loosen it by a quarter turn. The fan-door must move freely!
STEP 30 Connecting the extruder cables
Connect the Extruder motor cable to the connector on the top side of the
LoveBoard.
Connect the Loadcell cable coming from the right of the heatsink to the upper slot
on the right side of the LoveBoard.
Connect the filament sensor cable to the lower slot on the right side of the
LoveBoard.
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