4. Upgrading the Nextruder
56 Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade
STEP 27 Assembling the hotend fan
Attach the hotend fan onto the heatsink with two M3x18 screws on the left side.
Tighten the screw gently, but firmly, otherwise the plastic housing may crack. The
cable must be pointing towards the lower-left corner.
There is a sticker on the hotend fan, the sticker must be on the rear side of the
fan - not visible.
Guide the fan cable through the cutout in the fan holder.
Guide the fan cable between the thumb screw holes under the cable channel up
and connect it to the lower slot on the LoveBoard.
STEP 28 Print fan blower: parts preparation
For the following steps, please prepare:
MK4S Print fan blower (1x)
Fan-case (1x)
Fan-case-cover (1x)
Fan-shroud (1x)
3x8sT screw (2x)
M3x5rT screw (5x)
M3nS nut (5x)
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