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abraham.m
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A few MMU upgrades/Fixes

Oct 13, 2018 6:51 pm

Keepers for the MMU tension springs/bolts so you don't have to crawl on the floor if you flip open the device.
IMG_20181012_153739.jpg
IMG_20181012_153739.jpg (501.85 KiB) Viewed 106 times
https://www.thingiverse.com/thing:3152199


Drilled out and added setscrew to make it easier to work on selector:
IMG_20181012_154152.jpg
IMG_20181012_154152.jpg (1.53 MiB) Viewed 107 times
This is something that could have a captive but or at least a hole to thread into. It works as is but I assume it is a little delicate since there isn't a lot of plastic there.

Finally I added a Reset Button which doesn't have you looking for just the right thing to use each time, worrying about poking metal into the USB port on accident, etc.
IMG_20181013_104107.jpg
IMG_20181013_104107.jpg (412.04 KiB) Viewed 107 times
https://www.thingiverse.com/thing:3153356


And there's my already posted, but the Best upgrade I've done yet:
https://www.thingiverse.com/thing:3138950
I've gone as far as attaching the cardboard with tape because the clamps are ugly and I don't need to take the device apart as much as I was afraid of. This particular one has a strong need for a V2 to be more visually appealing, but it works great and took my printer for rarely working to rarely failing.

I would love to see others' modifications, and hopefully by interacting we can improve collaboratively.

paul.m27
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Re: A few MMU upgrades/Fixes

Oct 15, 2018 7:45 am

Very cool. I've had the tension bolts/springs fall on the floor multiple times. Once I had to crawl around with my son for 10 minutes before I found the spring. The bolt I can replace, the springs not so much.

I'm working on my own version of the wallet filament guide. I'll thingiverse it once I get it working to my satisfaction. I'm enjoying the engineering effort of thinking through how filament behaves and iterating in my design.

Paul

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abraham.m
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Location: San Diego, CA
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Re: A few MMU upgrades/Fixes

Oct 15, 2018 7:11 pm

I'm curious where you're going with it. If there's some interest, it would be worth making mine more pretty - so far crickets. And in use, I've just found little to nothing wrong with mine (run the filament horizontally, flexible filaments flop around a bit more).

The right way to do the tensioner is with weights. They don't care the size of the retract and the force is steady.

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abraham.m
Posts: 152
Joined: Dec 07, 2017 3:45 am
Location: San Diego, CA
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Re: A few MMU upgrades/Fixes

Oct 15, 2018 7:32 pm

I installed https://www.thingiverse.com/thing:3003239 in order to remove the additional transition from/to the secondary PTFE tube from the non-MMU i3.
IMG_20181015_121353.jpg
IMG_20181015_121353.jpg (1.36 MiB) Viewed 34 times

I found two similar ones which don't use metal parts:
https://www.thingiverse.com/thing:3139446
https://www.thingiverse.com/thing:3140127



This has mostly been a 100% positive adjustment, but I found the PTFE to be pulled pretty tight. I went to a longer piece of tubing (Capricorn, the looser/lighter stuff) and have been mostly happy, but it IS high friction than the orange stuff. If anyone knows where to buy this (Prusa will NOT sell it to me), please share!

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