Magnetic Quick Disconnect for MMU PTFE Tubes
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Magnetic Quick Disconnect for the MMU3 (and MMU2S) PTFE tubes, using 10 PC4-M6/M10 fittings and 16 6x3mm round magnets.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Prusa Parts & Upgrades
- Licencja
- Creative Commons — Attribution — Share Alike
I want to be able to easily remove my printer from my enclosure for maintenance. While the collets on the MMU3 make it quite easy to remove the PTFE tubes, I worry that it wears on the tubes and/or collets on every removal and insertion. My solution is this bracket, that on each side holds eight 6x3mm round magnets and five PC4-M6 fittings. It also has alignment pins for improved positional stability, that also make the parts fit together only one way.
I've added a slight chamfer to the bottom of my PC4-M6 fittings (using both a 4mm drill and a countersink bit) from earlier attempt to solve this problem with other models, but I don't think that's strictly necessary for this bracket. I'm only mentioning it because I haven't tried without it.
The hole spacing for the fittings is 14mm (center to center), same as the hole spacing of both MMU3 and MMU2S, so this shouldn't introduce extra bends in the filament path, exactly what I wanted to avoid.
Extra hardware needed
- 10x PC4-M6 fittings (I used these) or PC4-M10 fittings (I used these)
- 16x 6x3mm round magnets (mine are N52, specifically these)
Changelog
2024-05-18
- Updated the old files for MK4 and labeled them with PC4-M6 (the model is unchanged).
- Added untested PC4-M10 version (1/8" BSP thread). The PC4-M10 version has no stops for the PTFE tubes, just joins them end to end. The magnet spacing is different between the two versions (the magnets wouldn't fit in the PC4-M10 version otherwise), but the alignment pins are the same. This means it should be at least theoretically possible to use PC4-M6 on one end and PC4-M10 on the other.
2024-05-30
- Updated PC4-M10 version with tapered threads adapted from @jurassic73's thread model, since the straight threads didn't seem to work according to feedback. This version is slightly taller due to the thread model being taller than my previous threads. Still untested by me.
2024-07-01
- Updated PC4-M10 version once again. Now with looser threads, after some tolerance testing with actual fittings. No longer untested.