Is the MMU2 finally starting to come together?  

Re: Is the MMU2 finally starting to come together?

Jesus, just put another material in there already. You don't need months of work to do multimaterial, I think I did two successful prints then started playing with it. And they were successful about as quick as I could get nice tips, which was like a day or two.

There are LOTS of issues, but it's unfair to yourself to pretend you can't do something more advanced while still working on the basics.

I sure would give anything to have someone tell me what's wrong with my machine.

Part of the problem is that printing multimaterial has a lot more variables

We're still at early stages and don't yet understand what actually matters and what doesn't.

I'm optimistic because I can see that the community is gaining experience quickly

The problem isn't the variables - it's as you said: The community is gaining experience while the developers are sitting around with their fingers in their ears.

I just think it's unreasonable to say how it's really coming along when there is an active effort to slow development and not ask the user base what's going on.

Re: Is the MMU2 finally starting to come together?

I posted this in another thread but figured I'd ask here too. Is anyone with a mk2.5 and a mmu2 having success in stock form? Some threads suggest you need a mk3 heatbreak. Doesn't seem like prusa did any beta testing on the mk2.5 as they missed the whole 12v vs 24v thing till way late... Curious if I am a minority in my issues or if others are in the same boat.

Re: Is the MMU2 finally starting to come together?

I don't have a 2.5 BUT from what I would guess. try looking into getting your filament path as easy as possible. I think that would help with the tips and ramming.

Re: Is the MMU2 finally starting to come together?

I don't have a 2.5 BUT from what I would guess. try looking into getting your filament path as easy as possible. I think that would help with the tips and ramming.

That was my thought too and I spent a lot of time working on that aspect (alignment, polishing etc). My filaments move very freely all the way to extruder gears. From what I can tell from every video and forum thread, I've got it mechanically setup perfect. I just can't get a good tip with PLA that doesn't eventually cause a failure. I've tried 3 brands, solutech, esun and atomic but all the tips look identical. I've tried the inland pla ramming profile that is floating around here as well as just using the stock pla profile while tuning the initial retraction speed up and down from default.

My printer works perfectly in single mode. Besides the one person who changed out his heatbreak on the mk2.5 for a mk3 one, I haven't seen much info on folks with mk2.5's having any success.

Re: Is the MMU2 finally starting to come together?

I've tried the inland pla ramming profile that is floating around here as well as just using the stock pla profile while tuning the initial retraction speed up and down from default.

Play with different nozzle temps. Try to go as low as possible. You should see a difference on any filament.
After that you can still try different cooling runs/settings.

Re: Is the MMU2 finally starting to come together?

there's no assurance they are working on it, that the problems matter

The original designer of MMU (both 1 and 2) is working on it. And it does matter to him. Only problem is that he gets very little support from others.

There will be something new, but it's won't be for a while.

Peter

This is what led me to cancel my order that was set to ship Dec 9th. For months and months prusa hyped this machine, but now they have went totally radio silent. None of the usual influencers have mentioned it on youtube or anywhere else. From what I can tell, theres been zero interest from prusa to reach out to chuck, who made his own, or the other person who made the zero beast firmware. It went from seeing it everywhere to not seeing it at all now. I've asked for some type of update or responce from the company, but instead I just got lambasted by the fan boy culture. So I cancelled my order and will try out the palette 2 for the time being. i'm sure it will have lots of problems as well, but I get a better sense that its company is more active with their users.

Re: Is the MMU2 finally starting to come together?

I've tried the inland pla ramming profile that is floating around here as well as just using the stock pla profile while tuning the initial retraction speed up and down from default.

Play with different nozzle temps. Try to go as low as possible. You should see a difference on any filament.
After that you can still try different cooling runs/settings.

I can definitely see how that would help but I've got these filaments dialed into a really ideal temp for minimizing stringing while not compromising layer adhesion. I'd hate to affect my print quality just to fix this mmu2 thing. That was the primary reason I removed the mmu1 from my printer. I'll give it a try though.

Re: Is the MMU2 finally starting to come together?

I can definitely see how that would help but I've got these filaments dialed into a really ideal temp for minimizing stringing while not compromising layer adhesion. I'd hate to affect my print quality just to fix this mmu2 thing. That was the primary reason I removed the mmu1 from my printer. I'll give it a try though.

Fully understand that. Had to lower my temps also a lot. My preferred single extruder temp is much higher then MMU2 printing. But it's important to get it printing reliable. You can experiment with higher temps and settings afterwards knowing you have a working fall back.

Re: Is the MMU2 finally starting to come together?

For months and months prusa hyped this machine, but now they have went totally radio silent. None of the usual influencers have mentioned it on youtube or anywhere else.

I can see improvements being done all the time. For example check the difference between Firmware version 3.4 and 3.5. Or the work which is being done by the community like this rewind system or adding the springs to buffer the loading process - genious simple idea.
There is no need the Makermuse, Joel or any other influencer are promoting MMU2. Join the facebook groups and you will see how people are using this unit. No question, it can be still improved in many cases but it is already usable.

From what I can tell, theres been zero interest from prusa to reach out to chuck, who made his own, or the other person who made the zero beast firmware. It went from seeing it everywhere to not seeing it at all now.

I don't see a reason why PR should do that. Anyway, the software is open source and the usual way for improvement is either a pull request or new branch. Some people are doing drastic changes to the firmware. It's hard to merge big changes because you need to consider many things which are not directly related to this change. For example as you can see in another thread, the alternative firmware is less stable than original. It makes the whole firmware not usable in production.

I've asked for some type of update or responce from the company, but instead I just got lambasted by the fan boy culture. So I cancelled my order and will try out the palette 2 for the time being. i'm sure it will have lots of problems as well, but I get a better sense that its company is more active with their users.

Sorry to hear that. As you are still present in this forum it would be great if you could share your experience with Palette2 and the other community. Many of us are not PR biased and are always looking for alternatives.

Re: Is the MMU2 finally starting to come together?

I've asked for some type of update or response from the company, but instead I just got lambasted by the fan boy culture. So I cancelled my order and will try out the palette 2 for the time being. i'm sure it will have lots of problems as well, but I get a better sense that its company is more active with their users.

Sorry to hear that. As you are still present in this forum it would be great if you could share your experience with Palette2 and the other community. Many of us are not PR biased and are always looking for alternatives.
[/quote]

Thanks for the feedback and conversation. It is awesome how the community has helped with the unit, but I guess my point is that prusa should be open with what THEY are doing. They haven't even really acknowledged any faults. They've never said why they've disabled comms between the mmu2 and the mk3 filament sensor. They've never said why they've disabled the cutting feature. Both of these things were hyped by Mr. prusa in all the videos and shows. Just some acknowledgement would go a long way.

I am still active, because I do think one day it will be a good product. I love the mk3. I just hope to see the same effort and interaction in their mmu2 as the printers they make. And yes, I will give a full report on the Palette 2. I ordered a Pro, and it should be here Monday. The machine learning that theyve built into it seems to be getting some positive feedback so far.

Re: Is the MMU2 finally starting to come together?

I can definitely see how that would help but I've got these filaments dialed into a really ideal temp for minimizing stringing while not compromising layer adhesion. I'd hate to affect my print quality just to fix this mmu2 thing. That was the primary reason I removed the mmu1 from my printer. I'll give it a try though.

Fully understand that. Had to lower my temps also a lot. My preferred single extruder temp is much higher then MMU2 printing. But it's important to get it printing reliable. You can experiment with higher temps and settings afterwards knowing you have a working fall back.

Why are you not using the script to drop temps during ramming ? https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f53/script-to-drop-temperature-during-ramming-t24890.html

Re: Is the MMU2 finally starting to come together?

And yes, I will give a full report on the Palette 2. I ordered a Pro, and it should be here Monday. The machine learning that theyve built into it seems to be getting some positive feedback so far.

I will be very interested to hear your experiences. I own both a Palette+ and an MMU2 (you can read about my experience here: https://frozennorth.org/node/82 ).

The Palette+ works but only sort-of. It's highly prone to getting out of sync with the printer, leading to stripes of the wrong material and resulting unusable prints. I'm hoping the Palette2 in combination with the Canvas Hub will solve this problem. But after several months of experience with both the MMU2 and the Palette, I'm pretty well convinced that swapping filaments (the MMU approach) is more robust than fusing them (the Palette approach).

Re: Is the MMU2 finally starting to come together?

And yes, I will give a full report on the Palette 2. I ordered a Pro, and it should be here Monday. The machine learning that theyve built into it seems to be getting some positive feedback so far.

I will be very interested to hear your experiences. I own both a Palette+ and an MMU2 (you can read about my experience here: https://frozennorth.org/node/82 ).

The Palette+ works but only sort-of. It's highly prone to getting out of sync with the printer, leading to stripes of the wrong material and resulting unusable prints. I'm hoping the Palette2 in combination with the Canvas Hub will solve this problem. But after several months of experience with both the MMU2 and the Palette, I'm pretty well convinced that swapping filaments (the MMU approach) is more robust than fusing them (the Palette approach).

I may be able to speak to that...... Success with mmu2 and got palette pro 2 up and running yesterday. Dont worry I'll print a black filament sensor cover at some point, but grey was in the printer at the time.

First Impression - Major win. Out of box experience I wish I had with mmu2. 1st calibration easy. 2nd print 6 hours worked no troubleshooting - imagine that 🙂

Re: Is the MMU2 finally starting to come together?

Why are you not using the script to drop temps during ramming ? https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f53/script-to-drop-temperature-during-ramming-t24890.html

It slows down the print and I'm not fully convinced about the approach. It's not enough just to change the temp. IMHO it need be accommodated with a purge movement in order to create a nice tip and don't loose to much time. There is already a ticket open in Slic3r github and I hope the devs will make some progress in this area. I see a big room for improvement without changing the hardware or firmware.

Re: Is the MMU2 finally starting to come together?

And yes, I will give a full report on the Palette 2. I ordered a Pro, and it should be here Monday. The machine learning that theyve built into it seems to be getting some positive feedback so far.

I will be very interested to hear your experiences. I own both a Palette+ and an MMU2 (you can read about my experience here: https://frozennorth.org/node/82 ).

The Palette+ works but only sort-of. It's highly prone to getting out of sync with the printer, leading to stripes of the wrong material and resulting unusable prints. I'm hoping the Palette2 in combination with the Canvas Hub will solve this problem. But after several months of experience with both the MMU2 and the Palette, I'm pretty well convinced that swapping filaments (the MMU approach) is more robust than fusing them (the Palette approach).

I may be able to speak to that...... Success with mmu2 and got palette pro 2 up and running yesterday. Dont worry I'll print a black filament sensor cover at some point, but grey was in the printer at the time.

First Impression - Major win. Out of box experience I wish I had with mmu2. 1st calibration easy. 2nd print 6 hours worked no troubleshooting - imagine that 🙂

Very very interesting. If fusing with PLA and BVOH works reliable I might switch to Palette 2. If fusing with PLA, BVOH and flexible (below shore 90A) works reliable I think I will definitely switch to Palette 2.

Putting such an expensive piece of hardware on an inexpensive MK3 seems kind of ridiculous though.

I think that the general idea of the MMU2 makes more sense than the palette. It's a shame that prusa screwed up the engineering part of it.

Re: Is the MMU2 finally starting to come together?

I will be very interested to hear your experiences. I own both a Palette+ and an MMU2 (you can read about my experience here: https://frozennorth.org/node/82 ).

The Palette+ works but only sort-of. It's highly prone to getting out of sync with the printer, leading to stripes of the wrong material and resulting unusable prints. I'm hoping the Palette2 in combination with the Canvas Hub will solve this problem. But after several months of experience with both the MMU2 and the Palette, I'm pretty well convinced that swapping filaments (the MMU approach) is more robust than fusing them (the Palette approach).

I gave the palette + a try when it was on sale on amazon. At the 30 day mark I sent it back. I just couldn't make it work. The 2 seems to have addressed a few issues, especially with the machine learning aspect. I'll give it a 30 day period to make a decision.

Re: Is the MMU2 finally starting to come together?

Why are you not using the script to drop temps during ramming ? https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f53/script-to-drop-temperature-during-ramming-t24890.html

It slows down the print and I'm not fully convinced about the approach. It's not enough just to change the temp. IMHO it need be accommodated with a purge movement in order to create a nice tip and don't loose to much time. There is already a ticket open in Slic3r github and I hope the devs will make some progress in this area. I see a big room for improvement without changing the hardware or firmware.

The script sets the temps BEFORE the purging movements.

Re: Is the MMU2 finally starting to come together?

We're still at early stages and don't yet understand what actually matters and what doesn't. We know that if everything is just right it can work, but unexpected things (like using a certain brand of premium nozzle) will lead to failure.

What brand and nozzle?

Re: Is the MMU2 finally starting to come together?

We're still at early stages and don't yet understand what actually matters and what doesn't. We know that if everything is just right it can work, but unexpected things (like using a certain brand of premium nozzle) will lead to failure.

What brand and nozzle?

I saw it posted in another thread, the Olssen Ruby Nozzle. I have been using one since I was printing metal and wood filament, but now that I no longer am, I just switched back to a standard nozzle (the one that came with the Prusa) in preparation of receiving my MMU2 in February.

Is there a better nozzle (than the standard one that comes with the Prusa) that does not have problems with the MMU2?

Re: Is the MMU2 finally starting to come together?

Is there a better nozzle (than the standard one that comes with the Prusa) that does not have problems with the MMU2?

As long as you don't print with abrasive material or high temp, standard E3D brass nozzles are best choice and last very long.