4. Upgrading the Nextruder
52 Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade
STEP 19 Installing the idler and PG-cover
Back to the Nextruder.
Insert the idler assembly between the PG-ring and the extruder motor. There is a
cutout for the spacer in the main-plate. Line up the idler spacer with the hole in the
PG-ring.
Secure both parts with the socket set screw M3x25. Do not overtighten the screw!
The screw protrudes from the PG-ring after tightening.
Carefully remove all three M3x25 screws.
When removing the screws, hold the PG-ring (gold-brass part) to prevent it
from sliding out.
Place the PG-case on the gearbox and secure it with three M3x25 screws. Do not
tighten them completely at this moment.
The screws on the PG-case will be completely tightened during the self-test in
the final chapter.
STEP 20 Mounting the idler-swivel: parts preparation
For the following steps, please prepare:
Idler-swivel assembly (1x) you assembled earlier
M3x30 screw (2x) you removed earlier
Spring 15x5 (2x) you removed earlier
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