The upgrade package includes two spools (black and orange). Based on the color combination, some filament will remain unused. It serves as a reserve in case of a failed print (for the black&orange option only).
Fan-shroud is included in the package from Prusa, since it must be printed from ASA or similar.
Compared to the MK4 kit, the xLCD-cover and PG-front-case will be printed by your printer without the “Original Prusa MK4” signs, because a special post-processing is needed. However, the upgrade package includes stickers, which should create similar look. Applying the stickers is optional. See the assembly upgrade manual.
Optional: If you decide to upgrade your older Silver PSU to the newer Black PSU, remember to print PSU-cover.stl from the 'xLCD' folder in the 'Files' tab. Print settings are described below.
All the printer parts are separated into multiple G-codes, you have to print all of them. Each G-code has in its name either BLK or BLK_ORG, so you can load the correct color in advance.

Stage 3: Assembling the MK4/MK3.9 upgrade

Follow the instructions, prepare parts, then assemble your full MK4/MK3.9 upgrade.

Download the latest PrusaSlicer and use the following settings**:

** Note that print settings are recommended, but you can experiment with your own.

MK4/MK3.9 printable parts

Model information