@gr5, please, can we not just tell people that it cannot be done instead of giving them false hope by saying it works and risking fucking up their new UM3?
I honestly hate the video where the Adafruit guys say that you can use 1.75mm filament in the UM2, i have personally had to take apart and fix the ones at Stockholm Makerspace multiple times after newbies watched that video and bought 1.75mm filament which pushed melted plastic backwards around the thinner filament and solidly filled the hotend up to the top of the PTFE with molten plastic, causing a hell of a jam.
The fact is that 1.75mm filament will possibly extrude, but if it works it will just give you crap quality prints and it is highly probably that it will jam your hotend. Bad print quality and constant hotend jams are probably not something you want when you have bought a 3000€+ printer, so stay away from it. (if you want bad print quality and hotend jams, just go buy some 200€ kit printer with a badly machined clone hotend)
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meduza 191
No, you need to use 2.85mm filament, just like with all other 2.85mm 3D Printers.
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gr5 2,210
It's possible but you won't get very good quality. [gr edit:] And you can basically destroy your hot end with a huge glob of melted plastic if you don't print quite slow. So stick with 2.85mm.
But there is very likely going to be a 3rd party 1.75mm conversion kit. But 2.85 works best with um3.
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