Below is a list of parts needed to upgrade an MMU2S to MMU3 (for MK3S+ or MK3.5/S), and to convert an MMU3 for MK3S+ to an MMU3 for MK4/S or MK3.9/S.
MMU2S to MMU3 (for MK3S+, MK3.5/S) parts list
The only difference is the main cable. All other parts are the same between MMU2S to MMU3 upgrades, installed on either the MK3S+ or MK3.5S.
Printed parts are listed on the dedicated Printables page for MMU3 printed parts.
- Idler
- 6x 5x16sh shaft
- 2x 5x6x25bt bushing tube
- 1x magnet (10x6x2 mm) (not purchaseable separately, part of this set of magnets)
- 1x coupler 5mm
- 6x 625 bearing
- 1x magnetic ball 4mm (not purchasable separately, part of this set of filament sensor accessories)
- 2x blade
- 1x silicone stopper
- Pulley and ELE:
- 5x collet
- 5x PTFE tube 4x2.5x19
- 1x MMU PD-board addon
- Buffer:
- 10x PTFE 4x2.5x650
- 5x 693-2RS bearing
- 10x collet
- 5x 2.9x8.5 shaft
- Fasteners as per package (spares included):
- 4x spring
- 11x M3x30 screw
- 32x M3x6 screw
- 28x M3nS screw
- 25x M3n nut
- 38x M3x10 screw
- 4x M3x18 screw
- 3x setscrew M4x5
- Extruder parts:
- 1x PTFE 4x2.5x360
- 5x washer M3/3.2/9/0.8 A2
- Prusa lubricant
MMU3 for MK3S+ to MMU3 for MK4/S, MK3.9/S
- Printed parts for nextruder (Printables)
- Electronics cover set (Printables)
- 5x spoolholder set
- MK4/S, MK3.9/S parts for MMU3:
- 2x M3nN nut
- 2x magnet 3x1
- 2x M3x35 screw
- 2x M3x22 screw
- 1x PTFE 4x2.5x360
- 1x MMU3 printer cable - Buddy
- 1x Main Plate set MMU3 (needed parts: 1x main-plate PCCF + 1x O-ring 24.5x1.5)
- 20x zip-tie
From MMU2 for MK3S+ to MMU3 for MK4/S, MK3.9/S
Use the list MMU2S to MMU3, excluding the Extruder parts.
The main cable to use is the MMU3-to-xBuddy main cable.
Then, use the list MMU3 for MK3S+ to MMU3 for MK4/S, MK3.9/S for the remaining parts to equip on MK4/S or MK3.9/S.