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Prusa MMU3 for MK4 - Complete Assembly and 3D Print

The Prusa MMU3 for the MK4 3D Printer finally arrived April 2024 and here is my step by step assembly guide with many tips and tricks where I show how to assemble the MMU3 (Idler, Selector, Pully Body, Electronics), upgrade the MK4's Nextruder for the MMU3, and configure the software and firmware for both. I show the new Prusa Buffer and Spools, but then showcase my own custom Multicolor System, and finally print a test model to demonstrate. Prusa Links: Prusa 3D Printers - https://www.prusa3d.com/ MMU3 Assembly Guide - https://help.prusa3d.com/guide/1-intr... MK4 and MMU3 Firmware - https://help.prusa3d.com/downloads MMU3 Printable Files - https://www.printables.com/model/5316... Custom Parts Shown: PC4M10 Rear Connection Custom Part: https://www.printables.com/model/5424... Custom Colored Label Plate: https://www.printables.com/model/5425... Custom Spool and Filament Multicolor System (1:11:25) https://www.printables.com/model/5552... Alternate Buffer by Martin: https://www.printables.com/model/3081... PINDA Strain Relief: https://www.printables.com/model/1053... 3mm ID PTFE tubes throughout (the short ones in the MMU and behind it to the buffer/spools) https://www.amazon.com/gp/product/B07... My Printables Profile: https://www.printables.com/@Real3DPrints Basic Five Color MMU Test Model by Alloria: https://www.printables.com/model/1568 Chapters Intro: (0:00) Box Contents: (1:00) Self Printed Orange Parts: (1:32) Why Upgrade: (2:05) Where to Get New Parts: (3:49) Idler Body Bearings: (4:54) Idler Body Motor: (9:00) Idler Body Alignment: (12:16) Selector Magnets, Ball, Trapeze: (13:24) Selector Tubes, PTFE Cover: (15:04) Selector SuperPINDA, Cutter: (16:38) Pulley Body Bearings: (19:38) Pulley Body Custom PTFE tubes: (20:21) Pulley Body Front PTFE Holder: (21:29) Pulley Body Rear PTFE Holder: (22:26) Pulley Body Pulleys, Motor: (23:30) Pulley Body Alignment: (26:52) Pulley Body Selector Install: (27:28) Pulley Body Idler Body Install: (31:04) Pully Body Idler Screw Tension: (32:01) Required New Static Protection Parts: (32:59) Pulley Body Control Board, PD Board: (34:05) Pulley Body Cable Connections: (36:07) Pulley Body Cable Management: (38:46) Pulley Body Frame Holders, Label Plate: (40:05) Attach Serial Sticker, Mount MMU3: (42:05) Nextruder Disassembly: (42:48) Nextruder Idler: (44:48) Nextruder Swivel: (46:00) Nextruder Tension Screw: (49:29) Nextruder Gearbox Disassembly: (50:34) Nextruder Main Plate: (51:05) Nextruder Gearbox Assembly: (53:10) Chamfered side faces Nextruder: (53:44) Connect MMU3 Cable to MK4 Electronics Box: (56:29) Update MK4 Firmware: (57:38) Get MMU3 Firmware: (59:07) Turn MMU3 On: (59:46) Update MMU3 Firmware: (1:00:38) Fix Unload Filament Message: (1:01:46) GearBox Alignment: (1:02:40) Filament Sensor Calibration: (1:03:37) SuperFINDA Calibration: (1:04:26) MMU3 New Buffer: (1:06:00) Spoolholder Assembly: (1:07:43) Preloading Filament: (1:09:09) Custom Multicolor System Intro: (1:10:36) Updating Prusaslicer Config: (1:10:52) Custom Multicolor System Benefits: (1:11:25) Fixing Loose Pulley Grub Screws: (1:12:54) Preloading Filament Again: (1:14:05) Printing Five Color Test Print: (1:14:43) Conclusion: (1:16:01)