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Need help with MMU Slic3r settings.  

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JaniB
(@janib)
New Member
Need help with MMU Slic3r settings.

Hello guys, i have upgraded my mk2s to MMU last week and i run into a problem, the small printed parts now tend to be fused a bit, i attached a picture, these are custom nameplates, i used the stock Slic3r settings, nothing was modified, Pla 215c on first layer and 210c on others, bed on 60c, i tried also with single mode, but i got the same result, before this was not a problem, printed fine, the one with yellow was printed before MMU upgrade. Thanks!. Any suggestions and ideas are welcome. I played a bit with retraction but things got worse.

Posted : 11/12/2017 10:49 pm
mavu
 mavu
(@mavu)
Estimable Member
Re: Need help with MMU Slic3r settings.

It is most likely a result of having bowden tubes.
I have observed a loss of detail on small features too, and it seems to be mostly a problem of the printer not being able to "predict" where and how much exactly will be extruded at the start of a new line. (like the perimeter of a small feature)

I think you can probably dial this in with extrusion multipliers/speeds/retraction settings, but I kind of hope this will improve with the new linear advance feature in the latest firmware, because that should model the "Springines" of filament in the printing process better.

Have you tried the lastes firmware?

Posted : 12/12/2017 8:25 am
JaniB
(@janib)
New Member
Topic starter answered:
Re: Need help with MMU Slic3r settings.

Yes, i have the latest installed. I don't have jams, clogs, it was working on the first start but this thing is disappointing. I'm really out of ideas what to do.

Posted : 12/12/2017 9:18 am
mavu
 mavu
(@mavu)
Estimable Member
Re: Need help with MMU Slic3r settings.


Yes, i have the latest installed. I don't have jams, clogs, it was working on the first start but this thing is disappointing. I'm really out of ideas what to do.

I'm not sure there is anything you can do.

I have resigned to the fact that the print quality is just worse than the non-MMU version.

For example, I rarely get prints where supports are not fused to the model.
Stringing is often extreme (for MK2 levels)
And the surface finish is not as uniform as with the standard printer.

Posted : 12/12/2017 1:27 pm
JaniB
(@janib)
New Member
Topic starter answered:
Re: Need help with MMU Slic3r settings.

I totally agree with you, for larger objects this is okay, but not for smaller ones, i think i will disassemble for now, because i have to work and maybe in the future i will build another prusa printer to play with mmu. Btw i'm totally impressed about the whole thing how it works. Thanks for your help mate!.

Posted : 12/12/2017 2:48 pm
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