List of parts for MMU upgrades

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. 

• MK3S+ MMU3 printer cable - Einsy
  
• MK3.5/S MMU3 Printer Cable

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 ball 7mm (ferromagnetic, zinc-coated) 
  • 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

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. 

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

MMU3 for MK4/S, MK3.9/S to MMU3 for CORE One

If you have the MMU3, there are three different conversion kits to turn the MMU3 for MK4S into the MMU3 for CORE One.

Original Prusa MMU3 Enclosed

This kit comes with a top cover, so the printer will remain fully enclosed.

• Nextruder printed parts (Printables)
• Top cover, buffer, and unit printed parts (Printables)
• 1x MMU3 Top cover
• 1x MMU3 Metal holder
• 1x MMU3 Vent cover
• 2x M3nN nut
• 18x M3x10rT
• 2x O-ring 2.8x1.2
• 1x collet
• 2x PTFE 4x2.5x3.9
• 1x PTFE 4x2.5x390mm
• 12x magnets 20x6x2

Original Prusa MMU3 Lite

This kit does not come with a top cover, so the printer will remain open at the top.

• Nextruder printed parts (Printables)
• Buffer and unit printed parts (Printables)
• 2x M3nN nut
• 4x M3x8 screw
• 12x magnet 20x6x2 mm
• 1x PTFE 4x2.5x450

Original Prusa MMU3 Community Version Cable

Longer cable for the community version of the MMU3 for the CORE One. This version mounts the entire MMU3 unit directly on top of the printer, with an integrated buffer and spool holders. Note that you will have to source the fasteners and other non-printed parts on your own, as they are not available on the e-shop.

• Printed parts. Note that you will need around 4.5 kg of filament for the parts. (Printables)
• 13x M3x6 screw
• 13x M3x8 screw
• 37x M3x10 screw
• 17x M3nS nut
• 10x PTFE 4mm collet
• 5x Ball bearing 693 2RS
• 1x PTFE 4x2.5x390mm
• 5x PTFE 4x2.5x480mm
• 5x PTFE 4x2.5x170mm