MK4S IS NOT COMPATIBLE WITH THE MMU3  

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

I was told the opposite when I spoke with support last week after I ordered the Mk4S upgrade.

Me:   Hi, I just placed an order for the Mk4 to Mk4S upgrade kit. I currently have Mk4 with MMU3 and have just noted that the product page says the Mk4S upgrade is not compatible with MMU3. Is this correct?

Prusa:  Yes sure Do not worry it is compatible and you can continue using the MMU3

Prusa have the following on the MMU3 for Mk4S product page:

The high-flow nozzle in the MK4S allows for much faster printing. However, when using the MMU3, the standard nozzle makes much more sense. Why? While the MMU3 works fine with a high-flow nozzle, the increased volumetric flow results in higher filament waste during printing. In other words, the MMU3 delivers the best performance, the same speed and the highest efficiency (lowest waste) when combined with the standard nozzle in both MK4 and MK4S.

So, if you order a standalone MMU3 for the MK4S you will receive it along with the standard nozzle. In the MK4S/MMU3 bundle, you will receive both nozzles in the package - the standard one as well as the high-flow nozzle. For assembled MK4S in a bundle with MMU3, the standard nozzle will be pre-installed on the printer as the default.

RE:

I read that to mean that the high flow capability (which is the major "S" upgrade does not work with the MMU3 and that you will need to use the standard nozzle when printing with the MMU3.

To me that means that the MK4S is not compatible with the MMU3.  Yes you can use an MMU3 on the MK4 with the older, non-high flow, nozzle.

If this is the case than what is the purpose of upgrading at all???

Here is my conversation with Prusa Tech Support today:

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

Could it be a compatibility issue with the Obxidian high flow nozzle specifically?

I'm not technical with the different nozzles available, but the info I posted above from Prusa's product page definitely says the new high flow nozzle that comes with the Mk4S will work with the MMU3, but there will be no real benefits in using it plus there will be extra waste from purging etc.

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

This my option, but one of the more annoying problems with the MMU2 was getting proper filament tip shaping.  This was almost eliminated with the MMU3. 

With the high flow nozzle, the filament passes through multiple passages to increase melting capacity.  I'm pretty sure that will greatly effect filament tip quality and to be honest, I'm not sure that they can do it without compromising how well the MMU3 has been working, but we'll see.

But this will only be an issue if using the MMU for multicolor printing.  It will not effect single color prints except to give you a higher filament flow rate and greater print speed capability should you choose to use it.  Don't forget that the MK4S upgrade also improves part cooling which is a pretty big deal to most of us.

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

I'm going to wait until they get all of the issues worked out between the new high flow design and the MMU3 and they fully support the two together.

I have already cancelled my MK4S upgrade order.

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

Posted by: @steve-6

Could it be a compatibility issue with the Obxidian high flow nozzle specifically?

I'm not technical with the different nozzles available, but the info I posted above from Prusa's product page definitely says the new high flow nozzle that comes with the Mk4S will work with the MMU3, but there will be no real benefits in using it plus there will be extra waste from purging etc.

The only difference between the normal and obxidian nozzle is the hardness of the nozzle itself. I didn't have to change any print parameters when I switched to the obxidian nozzle that I recall.

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

From the MK4 to MK4S Upgrade page on Prusa's website.  Please see the highlighted MMU3 in the Not Compatible with section.

From this and my discussion with Prusa tech support I would say that the MK4S with High Flow is NOT compatible with the MMU3.

As I have said before, considering how long MK4 owners had to wait for the MMU3, this is a huge disappointment.

Are more upgrades going to be like this, where MMU3 users are left out in the cold?

I understand that the MMU3 creates additional issues but I would think Prusa can overcome them, quickly I hope.

Prusa, if you are paying attention to these forums and care about your customers opinions, please give us an official statement as to when the MK4S will work with the MMU3.

RE:

It is quite right that the MK4 is only in the compatibility list, as it is indicated there what the upgrade is for. And that is for the MK4 printer. That makes perfect sense. MMU3 is also not indicated on any other upgrade kit pages.

Original Prusa MMU3 upgrade kit (for MK4S/MK3.9S) can now be ordered separately, and the description includes information about the high-flow nozzle:

"The high-flow nozzle in the MK4S allows for much faster printing. However, when using the MMU3, the standard nozzle makes much more sense. Why? While the MMU3 works fine with a high-flow nozzle, the increased volumetric flow results in higher filament waste during printing. In other words, the MMU3 delivers the best performance, the same speed and the highest efficiency (lowest waste) when combined with the standard nozzle in both MK4 and MK4S...."

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

According to Alfredo C at Prusa tech support:

so, to sum up, mmu3 is compatible with the mk4s, the standard nozzle is recomended to lower the waste, by but the high flow nozzle will also work, there is a prusa slicer profile for the mmu3 mk4 with high flow nozzle

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

Posted by: @chitownguy

From the MK4 to MK4S Upgrade page on Prusa's website.  Please see the highlighted MMU3 in the Not Compatible with section.

 

Correct, you can not upgrade an MMU3 to MK4s, that's why it says it's not compatible.
An upgrade from MK4 to MK4s is only possible with an MK4, nothing else.

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

Alfredo at Prusa Tech Support said it best:

Posted by: @chitownguy

According to Alfredo C at Prusa tech support:

so, to sum up, mmu3 is compatible with the mk4s, the standard nozzle is recomended to lower the waste, by but the high flow nozzle will also work, there is a prusa slicer profile for the mmu3 mk4 with high flow nozzle

RE:

This is just Alfredo though.

The problem I have with his statement is that Prusa has yet to release a 0.6mm profile for the MMU3 and I had hoped that with the MK4S they would finally address that issue. But for now it seems that I can't natively use my normal obXidian 0.6mm nozzle without altering the profiles by hand NOR the High Flow obXidian 0.6mm nozzle that I ordered for multicolour prints. That is a huge bummer, if you ask me...

See here: https://github.com/prusa3d/PrusaSlicer/issues/12634

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

Posted by: @philipp-8

This is just Alfredo though.

The problem I have with his statement is that Prusa has yet to release a 0.6mm profile for the MMU3 and I had hoped that with the MK4S they would finally address that issue. But for now it seems that I can't natively use my normal obXidian 0.6mm nozzle without altering the profiles by hand NOR the High Flow obXidian 0.6mm nozzle that I ordered for multicolour prints. That is a huge bummer, if you ask me...

See here: https://github.com/prusa3d/PrusaSlicer/issues/12634

I kind of also have a bone to pick with Prusa and the MMU3.  They said that, eventually, they would support multiple material types on their Multi-Material-Upgrade.

I would love to be able to mix dissolvable filament with regular PETG filament in the MMU3.

RE:

Yeah, don't get me started on the non-existent TPU profile (which does work if you do it manually, I tried...).

After a chat with the support I was being told that he would pass on the issue with the still non-exsitant 0.6mm profiles for the MMU3 (not high-flow, just the normal ones after a year or so...) and that at the moment the high-flow nozzles would not be supported with the MMU3. So I am just going to stick to my normal obXidian with the custom profile for the 0.6mm nozzle since I am printing some abrasive materials. Not going to spend another 70€ for a high-flow nozzle that is not supported and does not have the normal profiles yet...

So only getting the upgrade for the cooling basically and for maybe printing something once in a while with the 0.4mm brazz high-flow nozzle, not using the MMU.

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

Posted by: @philipp-8

Yeah, don't get me started on the non-existent TPU profile (which does work if you do it manually, I tried...).

After a chat with the support I was being told that he would pass on the issue with the still non-exsitant 0.6mm profiles for the MMU3 (not high-flow, just the normal ones after a year or so...) and that at the moment the high-flow nozzles would not be supported with the MMU3. So I am just going to stick to my normal obXidian with the custom profile for the 0.6mm nozzle since I am printing some abrasive materials. Not going to spend another 70€ for a high-flow nozzle that is not supported and does not have the normal profiles yet...

So only getting the upgrade for the cooling basically and for maybe printing something once in a while with the 0.4mm brazz high-flow nozzle, not using the MMU.

After what Adolfo said and the several week waiting period I'm hoping that Prusa will have an update to the slicer and firmware so that the high flow nozzle will work with the MMU3.

I will admit that 85% of my printing is single color but through the MMU3.  I keep PETG in my MMU3 dry boxes and when I need to print something else I bypass the MMU3.

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

The nozzle does work with the MMU, in another thread you can see that there is a profile for a 0.4mm high-flow nozzle on the MMU, but this only seems to stop stringing and does not give a speed advantage but works at the same speed while using more material. For single coloured prints it should work as intended, even withh the MMU. But again, only a 0.4mm profile and I'd like to use a 0.6mm nozzle. I can live with it wasting a bit more material, but I am not trusting Prusa to release a 0.6mm profile soon.

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

I think you guys are piling on a bit.  They are one company at the forefront of a particular type of development and technology - that some part of development isn't done yet is entirely to be expected - there is perhaps a valid criticism about certain missing features in the Mk4S, but to be overtly "disappointed" might be better stated as "I'm not universally thrilled that I don't have al a carte access to all of the features I want at launch!" and probably a snooty "Harrumph!" at the end.  That outlook is at best a bit misguided; They're an open-ish source tech company (So having early access is kind of the whole freaking point, right?) that requires a community to - yea know "open" source it, be part of the development, because the community has sort of a role in this too, you're not just customers, outsourcing dev is part of the whole OS gig, et cetera, et cetera...

Bottom line is I have a mk4S printing it's little planetary gearset out in the other room right now and a fully built MMU3 waiting to be flashed as of this afternoon, I built it because that's the kind of maker I am.  If you wanted something like an automobile level of turnkey, well, I mean...honestly, you get that!  Order the assembled printer! But you only get a maturing level of functionality at launch because you're getting in on a developing technology - something that advances, and pretty quickly and constantly, too - that doesn't happen with a consumer printer to that degree - you get maybe a few updates until they release their next version.    

RE: MK4S IS NOT COMPATIBLE WITH THE MMU3

You shouldn't. It works. I received my upgrade and installed the HF nozzle, launched a multi color print on the presets for the MMU3 WITH the High Flow nozzle and it works. You can notice that it purges a bit more because of the design of a high flow nozzle, but its totally fonctionnal.

And even in the case were you notice that the tips of your filament are a bit off (wich in my opinion is the biggest concern here) you can simply activate the cutter on the MMU settings.