⬢Welcome to the tutorial on how to upgrade your Original Prusa i3 MK3/MK3S/MK3S+ to Original Prusa MK4S or MK3.9S.
The instructions are the same for both types of upgrades. MK3.9 has a few additional steps, which are thoroughly described. Please read the instructions carefully.
NOTE: The provided pictures feature the MK4S, so you may notice MK4S logos across the manual.
⬢Please prepare the upgrade kit received from Prusa Research.