MMU3 for MK3S+ upgrade parts required for use with MK4/MK4S - Hardware, firmware and software help https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/mmu3-for-mk3s-upgrade-parts-required-for-use-with-mk4-mk4s/ Prusa3D Forum Discussion Board en-US Thu, 21 May 2026 10:33:03 +0000 wpForo 60 RE: MMU3 for MK3S+ upgrade parts required for use with MK4/MK4S https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/mmu3-for-mk3s-upgrade-parts-required-for-use-with-mk4-mk4s/#post-744825 Tue, 08 Apr 2025 18:14:36 +0000 You still need parts to modify the filament sensor on the Nextruder. Look in the assembly instructions for MMU3 in the section for mounting the MK4/MK4S sensor to see what parts are needed. You can print them yourself, they are listed in the MMU3 printable parts. Some screws still need to be changed and a new round magnet 3 x1mm is needed.

]]> Hardware, firmware and software help miroslav.h4 https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/mmu3-for-mk3s-upgrade-parts-required-for-use-with-mk4-mk4s/#post-744825 MMU3 for MK3S+ upgrade parts required for use with MK4/MK4S https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/mmu3-for-mk3s-upgrade-parts-required-for-use-with-mk4-mk4s/#post-744228 Fri, 04 Apr 2025 23:42:37 +0000 MMU2S upgraded to MMU3 for MK3S+.  I am no now looking to upgrade it to be compatible ith MK4/MK4S.

From what I can tell these are the only parts needed? Can anyone confirm?

Main Plate set MMU3 - https://www.prusa3d.com/product/main-plate-set-mmu3/
MMU3 Printer Cable for MK4 - https://www.prusa3d.com/product/mmu3-printer-cable-for-mk3-5-3-9-4/

]]> Hardware, firmware and software help morreale https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/mmu3-for-mk3s-upgrade-parts-required-for-use-with-mk4-mk4s/#post-744228