TPU / flexible filament - no option in Prusa Slicer for MMU3  

You bypass the MMU, feed TPU direct and use the regular Mk4 profile.

Cheerio,

RE: TPU / flexible filament - no option in Prusa Slicer for MMU3

That is exactly how I am doing it as well. I have turned off the MMU in the settings menu and then just fed the TPU directly into the extruder.

and use the regular Mk4 profile.

 - not the Mk4+MMU profile.

Cheerio,

RE: TPU / flexible filament - no option in Prusa Slicer for MMU3

Posted by: @diem

You bypass the MMU, feed TPU direct and use the regular Mk4 profile.

Cheerio,

Thanks for this.
So I disable the MMU via the settings screen option in the Mk4.
Do I also need to make any settings changes for the filament sensor if I am bypassing the MMU3?

No

For very soft filaments you may need to lower the Nextruder idler pressure.

Cheerio,

RE: TPU / flexible filament - no option in Prusa Slicer for MMU3

From my reading of the manual on single color/filament printing, you should not need to turn off the MMU. Just slice to whatever regular profile you want and then select the filament you want from the user interface on the printer. It has worked for me.

RE: TPU / flexible filament - no option in Prusa Slicer for MMU3

but how do I create a profile in PrusaSlicer for the MMU and TPU?  The wizard only lets me choose *approved* filaments and I can't figure out how to transfer a profile from one printer setup to another.

RE: TPU / flexible filament - no option in Prusa Slicer for MMU3

In the filaments tab in the slicer click the little green flag next to the filaments list to allow non-approved filaments. That opens up *all* available filaments.

I've just done this with 3DJake TPU-95A filament and it loaded & printed fine (core one / mmu3). I think the softer or slipperier the filament, the less reliably it will print/load hence why they are not "allowed" so that's on you.

My next challenge is getting it to make PLA supports for TPU objects so I can print bellows and other such objects, like this:
U" target="_blank" rel="noopener">Functional Print Firday - 3D Printed TPU Bellows with PLA Interface Layers