Prusa MMU3 Spoolholder - Adding Ball Bearings, Prototyping Designs
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- เผยแพร่เมื่อ 7 พ.ค. 2024
- Here I show how I developed a 3D printed design to replace the plastic wheels on the MMU3 spool holders with ball bearings with a few parts. This video demonstrates the iterative design process of 3D printing and how you can go from an idea to an functional solution. Make small improvements, test them, and make changes to improve functionality.
If you want to print these parts I designed here in this video and add ball bearings to your spool holder the design files are free and here on Printables. You need four 7x22mm bearings as well per spool of course too -
www.printables.com/model/8587...
Chapters:
Prusa Spool Holder: (00:00)
Can we Improve the Bearings?: (00:25)
First design iteration: (00:40)
Second design iteration: (01:00)
Third design iteration: (01:20)
Fourth design iteration: (01:40)
Assembly: (02:25)
Final Result: (03:00) - วิทยาศาสตร์และเทคโนโลยี
Excellent idea and execution! I love how the standard 608 bearing fits the dimensions so well.
It is fortunate that the standard bearing size is just small enough to get a decent layer of plastic around it to mimic the size of the POM wheels
Great job. Good job engineering a better solution.
Thanks I had fund trying to do this. After I made this mod I made a PC4M10 adapter for the PTFE holder that is also on Printables too.
This is very cool! How would you benchmark the improvements the ball bearing wheels had over the plastic wheels for 3D printing?
Great work! :)
I wish I had a Newtonian force meter to pull the filament and see the difference in pull force required. It would be extremely nice to have an actual value.
@@real3dprints another thing I was thinking is an assisted filament reel with stepper motors that help maintain enough slack that the extruder doesn’t need to pull the reel. Might even be a cool project
@aarond791 Funny you suggest that as @oleurgast730 was suggesting the same idea. It would definitely improve things as an optional component.
Are the plastic ones causing troubles or why is there a need to add ball bearings? My MMU3 is still in pieces and if it's worth it, I do this modification from the beginning.
Look at your plastic spool wheels. It should say POM or ABS. If you have POM that is a better material that they moved to. That said, bearings should in theory be better than any plastic on plastic for rolling friction reduction. Personally I use a custom system with center bearings (see other videos on channel for this).
@@real3dprints They are POM. I'm trying with these first. Not sure if I keep using them anyway. Putting the original ones on top of the enclosure is not very elegant.
Less friction isn't always good. Depending on the bearings you use, your filament will keep rolling after the initial pull, resulting in too much filament being unrolled and it potentially getting tangled. Source: I made that experience. Not on these rollers but on similar ones.
@@gustavorings I saw the first version of the Prusa holders had real ball bearings. After I set up everything now, I do the spools inside enclosure modification on internal hanging holders. The current setup with 5 spool holders and the buffer on top of the enclosure is a pain.
@gustavorings I agree I have seen that too not on these things here in this post, but on my lower friction setup where I use custom center spool bearings. I am trying to come up with something where I can adjust a small sponge against the side of a spool or something like that without it being awkward, but still use center bearings with exact fit hubs. I have that design on printables.
thx for sharing ❤
i added you likes here and at ptintables. am still waiting for my mmu3 to come.
greetings from germany
Thank you! I tweaked the rods a little more this morning to widen them slightly so the center wheel doesn't drift side to side and to add a small chamfer to aid rod insertion into the bearing.