Should you buy the Prusa MMU3 Multi-color upgrade?! Unbox, assemble, and review

In this video I upgrade my two multi material upgrade MMU2s to the newest MMU3s. I'll do an unboxing, assemble the MMU3, do some test prints, and give a review!

0:00 Intro
1:10 Unboxing
1:31 MMU2 Disassembly
1:42 MMU3 Assembly
2:32 Loading Filament
3:40 Test Prints
4:32 Review
5:02 The Cons
6:41 The Pros
8:19 Thank You!

I used vibrant Yellow PEGT for my printed upgrade parts.

[Foodgeek]

A couple of days ago I changed my order for the MMU2 upgrade for MK4 to the one to the MK3S+ instead. Thanks for the video, it looks like it'll be pretty easy to put together 😊

[ColinKinross-vn]

I made needle roller bearings from PLA and mounted on a shaft which sits in a frame all made from PLA. These have been working for 4 years now with no problems and just made another 5 for the MMU i purchased recently to work with the MK3s+ upgrade to a MK4s. Mk4s now finished and making container dryer boxes to house the spool units and all looking great.

[rackbites]

Re the MMU2, I really enjoyed tracking down the bolts that fell out and rolled around the floor everytime I opened the MMU2 up to fix something ... glad they finally fixed that after 5 years. And then there was the known 5V issue (that they fixed with that little board included in the MMU3), but that can also be fixed on the MMU2 by rerouting the 5V line to bypass the dodgy diode ... Just a shame that Prusa didn't do anything about that for 5 years (and they knew about it from endless support calls) and that it was finally fixed by some users ... Prusa do make some great printers ... and then they sell complete garbage like the MMU2 that is only fit for hard core hobbyists to spend endless hours fixing ... all for roughly the price of a Bambu AMX ... I am amazed there was never a class action over the MMU2's ...

[JohnDoe-ejwp]

I already purchased the MMU3 upgrade, just watching for fun. Prusa lead times have been pretty good for me (in the US), I received the kit about a week after ordering. I agree on the spool holders, they're not great. What really sucks about them is that if your spools have any defects on the edge, they won't work. Most spools have slots along the edge to stick the filament in for storage. I have several spools where those slots were dented in during shipping. Catastrophic failure when trying to use them.

[ZacRicketts]

Great information. Thank you for the objective breakdown of the product.

[silvk]

I have Mk4 in prusa lack table enclosure (that was for mmu2s). Now I'm building the MMU3 and priting new buffer holders and spool holders to fit the lack enclosure. I hope for the best, thanks for the video

[markus]

Guess it'll be in stock in about a week or so, but if someone is particularly impatient until then: I ordered one without the printed parts and even though it showed two weeks lead time, it shipped the same day.

[ketse]

MMU2 fiasco is still fresh in my memory... saving for the 5 toolhead XL

[KanielD]

The main reason not to buy the MMU3 is that Prusa did a poor job supporting the MMU2. It’s nice to see them moving forward, however, it just seems that an upgrade could have been done much sooner.

[craigrmeyer]

For the spool holders, maybe you could fashion something heavy to insert into the center of the spool, to hold it down when it runs low on filament.

[JM-oqcz]

I guess i am one of the lucky ones with the mmu2s and not haveing any issues. Decided to get the upgrade kit cuz the loading of filaments looks so much better in addition to others ive talked to experience with the mmu3

[JesusMartinez-zuxl]

Looks pretty good! Would rather stick with my AMS and X1 from Bambu Labs though.

[hightde]

Do they have the cutter up and running on the 3? It seems that is part of the magic juice on the bambu machines is cutting the tips so they don't end up with any stringies to get hung up any where or trip a sensor or accident.

[hansstraat]

Orderd my mmu3s upgrade kit for mk3s+ yesterday evening, already have the dpd transfer code so should arive in about 6 day's. Are you going to test the Ultimulti vs prusa mmu3s also?

[NCIA-]

oh wow, quite a bulky mmu system. would never fit in my room. i need to think about this.

Is there a 3 color MMU instead?

[craigrmeyer]

Sir: HOW did you come up with those sheep files, such that some parts come out white, but other parts come out black? What wizardry is THAT?

[Platttraining]

I have 12 Prusa printers only 1 is a mini. To your point, the price and lead times for Prusa are almost prohibitive. I just got a P1S combo. Stunned that I got it in days due to US stocking, prices are great and reliability is amazing. The P1S runs nonstop and I need more multi color capability. Currently I'm looking at another P1S combo because of the Prusa cost and lead time.

[Trad]

Looking at the prices to upgrade my mk3s to a 3.5 and order a new Mmu (do not have one currently) I’m looking at 600 shipped. I might as well sell my mk3s and buy a bamboo labs already assembled. Probably cost less as well

[CaptnDirt]

So what multiple materials will it handle? I don't recall you mentioning what materials you tested. You mention colors but I'm not interested in that.

[cmputer]

Does this system need a filament cutter in the extruder? Also can someone explain why this doesn’t need to poop out filament like the Bambu AMS? Or maybe I missed it and it does poop. I see the concept is essentially the same although different method and form factor.