Alternate Nozzles with MMU3  

RE:

I use it with the 0.25 mm nozzle. You should start with a MMU preset and change parameters (can't exactly remember what I did but "Nozzle diameter" might actually be enough). I found there are quite a few parameters, most are fairly robust.

Changing a non-MMU preset to MMU might be harder. I suspect there are changes in G-code, it simply didn't load the filament when I tried. I'm sure it could be sorted out by A/B-comparing presets 

Hint: there is the "preload filaments" option on the control panel. Use that to exercise a few dozen cycles "under supervision" with a new MMU.

0.25 mm has the advantage that blob-of-doom vs spaghetti monster slug-out incidents are rather microscopic 🙂

RE: Alternate Nozzles with MMU3

Thanks for the info. 

RE: Alternate Nozzles with MMU3

I just remembered something: For higher objects you may need to pay attention to the wipe tower settings or it may shear off halfway.

RE: Alternate Nozzles with MMU3

Also, the filament may wear out with the small nozzle (depending on the print, of course) as the filament moves a lot back-and-forth without much going forwards.

It will flatten and eventually cause extruder sensor errors or if you're lucky just a warning that there were "multiple filament loading errors during the print".

This happens to me usually ~6h into a two-filament print.

It could probably be solved by cranking up purge volume (fairly low in my presets e.g. 10 mm³ in my everyday use, running into said problem where the last ~400 mm of filament become considerably thinner).