MK4 Reverse Bowden Adapter (attaches to PC4-M10 or directly to your 4.1mm OD PTFE tube)
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Use a PTFE tube to feed filament to a Prusa MK4 without a Festo QSM-M5 fitting
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Model information
- Source
- Printables
- Category
- Prusa Parts & Upgrades
- License
- Creative Commons — Attribution
The Prusa MK4's extruder filament inlet has a threaded M5 hole for which Prusa provides a Festo QSM-M5 fitting to use with MMU3. This model replaces the QSM-M5 in a reverse bowden system for the MK4.
The adapter is designed to take a PC4-M10 coupler, but it is also designed to be able to work without one. You can use a PTFE tube with an outer diameter of approximately 4.1mm and still be able to secure it to the adapter through a recessed hole.
You can print this upside down without support in approximately 12 minutes on a MK4. Using a PETG filament is recommended.
This was largely inspired by https://www.printables.com/model/550181-mk4-reverse-bowden-adapter-coupler-edition and https://www.printables.com/model/547831-mk4-reverse-bowden-adapter. I created this version as the others were only secured by friction and would come loose.