Stabilizer Bracket for the MMU3 Injection Molded Spool Holders
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This solves a problem with the MMU3 "injection molded spool holders", keeping them stable, evenly spaced, and parallel!
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- Printables
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- Prusa Parts & Upgrades
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- Creative Commons — Attribution — Noncommercial — NoDerivatives
This solves a problem with the MMU3's “injection molded spool holders” which are, in my opinion, inherently unstable.
Due to the complexity of the five-spool setup and multiple moving/unconstrained parts, the spools have a tendency to fall off the spool holders when you try to set everything up for a multi-material print, leading to frustration and wasted time.
One root cause of the problem is the unconstrained relative motion of what Prusa calls the spool holders' “Base” parts (which I call "roller carriages") on their respective “Guide” part (which I call the “lateral crossmember”). There are too many degrees of freedom in the design, resulting in instability.
My solution is to install a spool holder stabilizer bracket spanning between the two roller carriages, using the preexisting geometric “diamond hole” features on the top of the parts to attach the stabilizer bracket. The bracket has protruded ribs on the bottom which act as parallel stops to hold the roller carriages firmly parallel and at a fixed width which is perfect for standard 1 kg spools. The bracket also has two additional rib protrusions to firmly hold the PTFE Holder/Filament Guide directly in the center between the roller carriages, and perfectly parallel. I have tested this design through multiple design and prototype iterations, and I feel that it is ready to share with others.
I have provided the following files:
- STL of the bracket
- 3MF and G-Code files for MK4 (with and without MMU3), and as single prints or as a full set of five.
This design requires no supports and is done in PLA filament. If you desire, you can also slice this in PETG and print it that way.
Happy Printing! And, in the spirit of continuous improvement, I hope this helps make your life better. If you have further improvement / enhancement suggestions, please let me know. If you would like different width versions, tell me the center-to-center width you would like to have, and I can upload another variant.
Cheers.