MMU2 - Real Multi Material - User mods - OctoPrint, enclosures, nozzles, ...

RE: MMU2 - Real Multi Material

Anachronist — Wed, 12 Jun 2024 17:15:59 +0000

Posted by: @nikolai
This is the next step towards the real multi material printing

I know this is an old thread. If anyone isn't aware, there's been a pull request for Prusa Slicer for over a year, that incorporates the logic described in this script. The PR is here: https://github.com/prusa3d/PrusaSlicer/pull/9737 - it's gone through some evolution since I created the PR as can be seen by the comments and the updates in the description.

You would think, now that the MMU3 is available, that Prusa would have some interest in merging this change into a release. But for now, you have to compile your own PrusaSlicer with the two updated files WipeTower.cpp and WipeTower.hpp.

RE: MMU2 - Real Multi Material

ssill2 — Fri, 22 Dec 2023 20:34:48 +0000

so I looked at your model and I think I printed this once in straight tpu(in plain jane MK3S+) and I didn't like the artifacts left by the supports. I was just curious how this would turn out on the XL so I'm trying one with Sainsmart tpu + PLA supports + BVOH interfaces. This kind of use-case(tpu with supports) is of great interest to me since my wife likes me to print things in tpu and I kind it's been something I've been experimenting with over the past several days but using aquasys 120 as the support interface instead of bovh.

So far this is what it looks like. I noticed I missed painting a couple supports, but so far it actually doesn't look bad. 471 tool changes with a 5h 16 min print time lol

Posted by: @ssill2
wow, you're braver than I ever was with the MMU. I tried loading tpu exactly one time, and pretty much what I expected to happen did lol This was on MMU2S which I don't think officially even supports doing TPU for obvious reasons(i.e. reliable filament loads/changes/tip shaping is hard enough on rigid filaments, let alone expecting it to work for tpu). This is why I got the XL. That actually does tpu multi material alright.

RE: MMU2 - Real Multi Material

ssill2 — Fri, 22 Dec 2023 16:54:38 +0000

wow, you're braver than I ever was with the MMU. I tried loading tpu exactly one time, and pretty much what I expected to happen did lol This was on MMU2S which I don't think officially even supports doing TPU for obvious reasons(i.e. reliable filament loads/changes/tip shaping is hard enough on rigid filaments, let alone expecting it to work for tpu). This is why I got the XL. That actually does tpu multi material alright.

RE: MMU2 - Real Multi Material

maetthum — Mon, 06 Nov 2023 20:29:18 +0000

@joantabb

Just finished another test run. Increased purging volume for TPU on load to 300 and set the last layer to PLA support only. Now it seems to be allot stronger! Need to print the full model and pull on it again...

@nikolai

Sorry half of my TPU print was missing in the test file... this is the final below.

Any recommendations regarding post processing TPU if using TPU support? So far with a Stanley or carpet knife I'm not able to achieve nice looking surfaces. Supports stick just too well on the model :-(

GoPro11 Mount Titan DC5 15°.3mf

RE: MMU2 - Real Multi Material

Nikolai — Mon, 06 Nov 2023 17:25:06 +0000

Posted by: @maetthum
Is there a procedure you would recommend?

Hi. Even if I would like to see my script being used, it's not really needed in your case. :)

I would rotate this model by 180 degrees and print in TPU only. The sticky support for one leg can be easily cut off in post processing. TPU material is really easy to work with in post proc.

RE: MMU2 - Real Multi Material

JoanTabb — Mon, 06 Nov 2023 17:05:41 +0000

Have you tried increasing the purge volumes during changes to tpu?

RE:

maetthum — Mon, 06 Nov 2023 13:44:02 +0000

Hi! I'm trying to print in TPU and make the supports in PLA. Is there a procedure you would recommend? Is the script still needed for the PrusaSlicer 2.6.1? The TPU part is a GoPro mount for my drone and some of it I would need to start printing midair so... Layer adhesion is very bad, most probably because of mixing TPU and PLA.

So far I found following things what I'm considering to test:

script of @nikolai
ramming
buy a XL with double head instead of my MK3S+ with MMU2S

GoPro11 Mount Titan DC5 15° test.3mf

RE: MMU2 - Real Multi Material

Hello — Sat, 05 Aug 2023 19:53:46 +0000

When my mmu3 gets here I'll use that thanks so is it the same script sli3r uses

RE: MMU2 - Real Multi Material

Nikolai — Sat, 05 Aug 2023 19:40:13 +0000

You set the temperature in the slicer. So if you set your PETG to 203C and PLA at 180C, it will use it accordingly.

RE: MMU2 - Real Multi Material

Madcamper — Sat, 05 Aug 2023 19:38:18 +0000

Great! I was looking through the script and not sure I see where to set the high temp and the low temp or does it do it based on the temperature set for said filament? I generally print PETG at 220-230 but that temperature causes too much stringing on the filament when it is retracted to the MMU. I've found that 203c appears to be the perfect temp(so far) to prevent any string strands on the filament when extracted to the MMU but printing the whole print at 203c causes lots of blobbing on the hot end. Sorry if it's mentioned somewhere but I couldn't find it.