does your MMU2 work with 100% reliability while spending less than 1 day of troubleshooting ?

Yes
16%
14
No, it took me way longer to get it to work
21%
18
No, I did not get it to print with 100% reliability even after extended troubleshooting
62%
53
 
Total votes: 85
marc.o2
Posts: 7
Joined: Apr 30, 2018 9:08 am
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MMU2 - will it ever work reliably ?

Dec 13, 2018 10:02 am

Hello,

I have been troubleshooting my MMU2 now for a few days (+/- 20 hours excl. assembly) without being able to get it to work reliably.
During that time I have read a lot on the forums and internet about people who have similar issues as I have. I was shocked when I saw that it took people weeks and months to get their MMU2 to work with a reasonable reliability (99% filament changes). While this percentage might sound impressing at first, it implies that large prints which require hundreds of filament changes will fail.

I´m using my 3D printer as a tool which enables me to create my hobby-projects. I do not want to waste my time on getting the tool to work as it is supposed to. Had I know before buying the MMU2 that this is not a reliable product, I would not have spent my money on it.
I´m not prepared to spend frustrating weeks trying to troubleshoot the MMU2 not knowing if it ever will work as expected.

Perhaps you say that this is all my fault of not being able to assemble the MMU correctly, not being able to troubleshoot the issues one after the other, not being able to tune/correct the hardware and not willing to invest weeks of my time to get it to work.
But if someone told me before purchasing the MMU2 that I was expected to do all of the above to get it to work, I would have saved my money and looked for other options even if they were more expensive.


Regards,

Marc

Best Answer by Djamuka » Dec 13, 2018 3:20 pm
Hi there, I'm 100% with you marc.o2!

For the vote, I think it's important to know the printer MK2.5 or MK3 , it's seem the MK2.5 users have most trouble than MK3 user....

GO TO FULL POST ➙

daniel.s107
Posts: 6
Joined: Jul 17, 2018 6:11 am
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Re: MMU2 - will it ever work reliably ?

Dec 13, 2018 2:23 pm

Hello,

i have my MMU2 for a week now and i didnt have any problems so far... i didn't even have to troubleshoot something at all, just built it up and it works. I never opend the MMU Idler or had skipped layers. For me it works reliable. I hope it stays that way.

Greets
Daniel

Djamuka
Posts: 23
Joined: Dec 02, 2016 7:10 pm
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Re: MMU2 - will it ever work reliably ?

Dec 13, 2018 3:20 pm

Hi there, I'm 100% with you marc.o2!

For the vote, I think it's important to know the printer MK2.5 or MK3 , it's seem the MK2.5 users have most trouble than MK3 user....

dryja123
Posts: 514
Joined: Oct 28, 2017 3:30 pm
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Re: MMU2 - will it ever work reliably ?

Dec 13, 2018 3:58 pm

MK3 user with the MMU 2.0. I spent 3 months of tweaking and troubleshooting with the unit before I asked Prusa for a refund this week. Wasn't able to get a single successful print.

Every print failed by having a missing layer or stripping the filament. I've used Push Plastic ($30 a roll) PLA and Inland ($15)

User avatar
cyrille.p
Posts: 148
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Re: MMU2 - will it ever work reliably ?

Dec 13, 2018 5:25 pm

Hello,

I've got a mk2.5 + MMU2 since 1week now, and I'm trying to have only one successful print...without success. My mk2 then mk2s then mk2.5 worked flawlessly (for more than 2 years now), and I often do some colorprints (the old way, with M600) and this worked very fine. I even print colored object with different colors on the same layer (everything done by hand).

I was expecting a lot more from this MMU2 and I must admit I'm very disappointed. We are some french friends who have this mmu2 unit and we are all facing a lot of problems, too much problems.

I hope I will find a way to have at least one print working...I'm still reading those forums and experimenting to find a way to make the mmu2 work as it should be.

P.S: by the way, all my tests are done with 2 rolls of prusament and I'm using standard configurations (mk2.5+mmu2) with slic3r PE 1.41.1. Firmware 3.5.0 (1.0.2), extrudeur R3/B7
My youtube channel about the Prusa I3 MK2 https://www.youtube.com/channel/UCz-zQZ ... d9C9hOKYWg

dryja123
Posts: 514
Joined: Oct 28, 2017 3:30 pm
Answers: 1
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Re: MMU2 - will it ever work reliably ?

Dec 13, 2018 6:55 pm

What really frustrates me about the MMU 2.0 is the cost and the experience. For $300 I'd expect a product that works reliably out of the box. I don't recall seeing a single post or seeing a single YouTube video with someone sharing a consistent perfect experience with the MMU.

Think about the contents that come in the MMU 2.0 packaging. With the MMU you get some steppers, prints, bearings, and hardware. Compare the $300 to $600, the cost of a MK2S, and then you'll realize that you're getting very little for what's being charged. Simply put, I'm not seeing the value with the MMU 2.0 if I cannot get a single dang print out of the thing after 3 months of trying every mod that seems to be the flavor of the day.

I'm very disappointed with this product and I feel cheated. Support hasn't been helpful and I truly feel like I've been taken advantage of after giving them my money nearly a year ago and getting this.

marc.o2
Posts: 7
Joined: Apr 30, 2018 9:08 am
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Re: MMU2 - will it ever work reliably ?

Dec 14, 2018 8:17 am

I asked PRUSA support if they could exchange my MMU with a unit assembled and tested by PRUSA but they declined. The only thing they provide is support in troubleshooting.

I´m wondering, if the reason why they are refusing to deliver assembled and tested MMU2 is the fact that they would need to give a guarantee for the product to work, but as long as the customer has to assemble the MMU2 himself they do not need to provide any guarantee as they can always blame the customer.

marc.o2
Posts: 7
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Re: MMU2 - will it ever work reliably ?

Dec 14, 2018 9:54 am

wasted another 3 hours troubleshooting this morning of which 1 hour together with the support

dryja123
Posts: 514
Joined: Oct 28, 2017 3:30 pm
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Re: MMU2 - will it ever work reliably ?

Dec 14, 2018 1:11 pm

marc.o2 wrote:
Dec 14, 2018 8:17 am
I asked PRUSA support if they could exchange my MMU with a unit assembled and tested by PRUSA but they declined. The only thing they provide is support in troubleshooting.

I´m wondering, if the reason why they are refusing to deliver assembled and tested MMU2 is the fact that they would need to give a guarantee for the product to work, but as long as the customer has to assemble the MMU2 himself they do not need to provide any guarantee as they can always blame the customer.
I think there are machine variables at play too. When Prusa processed my refund they asked me for my observations. They had some suggestions on some things to try to increase the probability of success. One thing they suggested was drilling out the extruder body to widen the filament path to decrease the drag on the filament. Their other suggestion was replacing the thermal paste on the heatbreak.

Still pretty frustrating that its extremely unlikely to have a good out of the box experience.

marc.o2
Posts: 7
Joined: Apr 30, 2018 9:08 am
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Re: MMU2 - will it ever work reliably ?

Dec 14, 2018 3:26 pm

Hi dryja123,

My impression is also that the problems come from having too much friction on the filament inside the MMU.
When trying to push the filament thru the MMU by hand, it is quite difficult and requires quite some force. The annoying thing is that when trying this
MANUAL load with different filaments, some filaments pass without requiring much force while others require a LOT of force. This seems to indicate that the holes for the filament are too tight and depending on the filament quality and its tip (is it well cut, does it have a small blob ?) the filament gets stuck.

I was already thinking that the MMU would work better,having bigger holes and without the PTFE tubes but having a much smoother inside part finish (Ex. ABS smoothed with Acetone) such setup would reduce friction of filament and eliminate any potential edges inside the holes where the filament could get stuck.

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