The MMU3 Enclosed Conversion Kit lets you transfer an existing MMU3 from the MK4S to the Prusa CORE One without sacrificing the benefits of a fully enclosed chamber. A modified top cover with a PTFE pass through keeps everything sealed while enabling multi material printing with up to 5 filaments.
This conversion kit allows you to move an existing MMU3 unit from an MK4S to the Prusa CORE One or CORE One+. It includes a modified top cover with a pass through for the PTFE tube, so the printer remains fully enclosed after installation.
Note: You will need to disassemble the MK4S extruder to reuse certain parts in the CORE One's extruder.
Nozzle Recommendation: For optimal MMU3 performance, Prusa recommends using the standard nozzle rather than the high flow variant. The standard nozzle provides better speed, efficiency, and lower waste during filament changes.
PTFE Fitting Compatibility: If upgrading from an MK4/S, check your PTFE fitting version before installation. Refer to Prusa's assembly instructions for details.
The MMU3 is an add-on for Prusa printers that enables printing with up to five filaments at once. It is the fastest and most efficient single nozzle multi material system available, producing high quality prints with minimal waste. Unlike similar solutions that generate byproduct heavier than the printed object itself, the MMU3 deposits excess material into a compact wipe tower at the edge of the print area.
Load the filaments, slice your model in PrusaSlicer or EasyPrint, and start the job. The MMU3 handles filament switching automatically, delivering colorful results quickly and efficiently.
The MMU3 for CORE One is available in two versions. Both use identical hardware: the MMU3 unit, buffer, and spoolholders.
Lite version: Mounts on top of the printer with the top panel removed. Installation is quick and easy, but you lose the benefits of a fully enclosed chamber. A replacement top cover can be 3D printed if needed. This version is ideal for users who want to swap the MMU3 between an MK4S and CORE One with minimal effort.
Enclosed version (this listing): Includes a modified top cover with a pass through for the PTFE tube. The printer remains fully enclosed, preserving temperature control and the benefits of the chamber.
CORE One printer and MMU3 unit not included.