Just ordered my Prusa i3 MK3S kit! Merry Christmas... me
Congrats, you'll love it! Just don't make the mistake I did and get a MMU thinking it would be a fun add-on. I thought it would be nice for soluble supports and occasionally nice for multi color prints. But mostly just nice to be able to swap between a couple of commonly used filaments automatically.
Well, soluble filament is crazy expensive and needs very careful storage...and whatever they've done in slicer lately had made supports so much nicer and easier to remove anyway that I haven't felt the need to try soluble filament yet. (I still want to...but...I also don't trust the MMU enough yet.)
Multi color prints...my daughter likes them...but almost every one I've done so far the wipe tower weighed more than the print and I mostly do functional prints where multi-color isn't really helpful. Though I did just use it to do some labels on a marble clock I'm building which was nice. Though I was nervous trying it because (again) I really don't trust the MMU.
Swapping colors...well...the filament buffer is a huge pain to deal with (especially if you have the printer in an enclosure like I do) and loading/unloading into the MMU is a major hassle. Once it's in the MMU there's no guarantee it will load accurately either so this hasn't been much of a benefit either.
The big issue is the new hot end filament sensor with the 's' upgrade. It just doesn't seem to be as reliable for me as the old optical sensor (which apparently gave other people problems but worked great for me even with clear and translucent filaments) was which causes the MMU to have a really hard time telling when the filament is actually loaded all the way to the hot end. Resulting in filament getting ground in the MMU and the hot end which in turn means I have to disassemble both to clean out the filament dust or the problem just gets worse and worse.
And the MMU seems to be REALLY picky about filament. With just the stock mk3 even my cheap troublesome filaments printed great. But with the MMU even some of my nice usually trouble free filaments give me headaches now
Love my Mk3...but really kicking myself for splurging on the MMU. At least I had the mk3 for a good 4 or 5 months to fall in love with it before the MMU arrived (and then another month or two before I got around to installing it.)
