MMU2S Coupling for Magnetic PTFE Joiner
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The MMU2S coupling is an addition to the design of Xuis based on the no offset (default) version with 5x5 magnets
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Updated at source:
Model information
- Source
- Printables
- Category
- Prusa Parts & Upgrades
- License
- Creative Commons — Attribution — Noncommercial
This Design replaces the use of 5 PTFE tubes with 5 fittings. For easy access it is angeled by 45 deg. For increased accessibility it is recommended to mount the MMU2 unit in a horizontal position with modified brackets, see
https://www.thingiverse.com/thing:3129292
In my design I used the variable names from Xuis's design.
So if it is necessary to adjust it for your purposes, open the design in Fusion360 to change it!
This link points towards the most up-to-date version of the file:
Printing
I used PETG
No support
height 0,2 mm
Adjusting the magnet openings for a tight position with “MagnetTolerance” (0,16 mm in my case), otherwise use glue.
Assembling
To fasten the Magnet Carrier to the Guide I used M3 - threaded inserts, see
- Cut 5 pieces of PTFE tube to a length extending about 10 mm out both sides of the Guide.
- Insert them into the Guide and position the tube ends to the openings of MMU2S pulley body.
- Chamfer the tube ends with a 2mm center drill
- Push the tube ends into the MMU2S pulley body (it is about 5 mm)
- Slide the Guide into position and screw it with the M3 screws of th Purse MK3 kit.
- Position the MagnetCarrier (with mounted magnets) to the Guide and fasten it with 3 M§x10 screws
- Cut the PTFE tube ends and chamfer the tubes with a 2mm center drill.
Done
Hint: to make it easier to insert the tubes though the Guide and into the MMU2S pulley body it can be useful also to chamfer the outside of the tube ends a little bit. ( I used a pencil sharpener)