RE: TPU on MMU3
Here is a simple procedure:
In PrusaSlicer, go to the Plater tab and select the Original Prusa MK4S 0.4 nozzle printer (or another TPU-compatible Prusa printer). Go to the Filament settings and choose your desired TPU profile (e.g., Prusament TPU 95A @MK4S). Click on the Dependencies tab. In the "Compatible printers condition" field, delete the text: and ! single_extruder_multi_material Save a copy of this new profile.
The profile will now be compatible with printers equipped with an MMU.
RE: TPU on MMU3
I played around quite a bit with different settings and hardware modifications to get TPU to work on the MMU3, not only during single-material prints, but with true multi-material prints (so for example TPU and PLA). I have finally got it reliable enough to attempt big prints (so 100+ filament switcher in one print). I made a guide on Printables with all my components and settings, in case someone else wants to attempt this too:
https://www.printables.com/model/1356306-mmu3-printing-with-tpu-parts-and-settings
Here is a sample print that I did:
RE:
Here is a simple procedure:
In PrusaSlicer, go to the Plater tab and select the Original Prusa MK4S 0.4 nozzle printer (or another TPU-compatible Prusa printer). Go to the Filament settings and choose your desired TPU profile (e.g., Prusament TPU 95A @MK4S). Click on the Dependencies tab. In the "Compatible printers condition" field, delete the text: and ! single_extruder_multi_material Save a copy of this new profile.
The profile will now be compatible with printers equipped with an MMU.
To take this one step further -
1) I selected a single nozzle printer profile
2) Clicked the Filaments tab on top
3) chose dependencies on the left menu
4) copied the "Compatable Printers Condition" from that filament (Generic PLA in my case)
5) I then selected the filament that was not showing under the MK4S-MMU3 Printer profile
6) Copied the filament profile that I wanted shown (TPU/Flex in my case)
and pasted the following condition:
printer_model=~/(MK4S|MK4SMMU3|MK3.9S|MK3.9SMMU3)/ and nozzle_diameter[0]!=0.8 and nozzle_diameter[0]!=0.6 and nozzle_diameter[0]!=0.5 and nozzle_high_flow[0]
Keep in mind, this condition is for My printer: Mk4s MMUs with .4HF Nozzle
If this is not your setup I recommend following the steps i mentioned above to replicate your printer.