4B. Upgrading the Nextruder (MMU3)
86 Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade
STEP 31 LoveBoard: Wiring check
Before covering the electronics, check the connection of all cables. Click on high-
resolution preview in the top left corner.
Close the idler mechanism before proceeding to the next step if you haven't
already done so. Use the following sequence:
Close the extruder idler to the extruder
Close the idler-swivel and lock it over the extruder idler assembly
STEP 32 Covering the LoveBoard: parts preparation
For the following steps, please
prepare:
LoveBoard-cover (1x) new part
LoveBoard-cover-right (1x) new part
M3x10 screw (1x) you removed
earlier
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