If you have a modern 3D printer, most likely the "CoreXY" design that's become so popular, then you may have noticed a little rectangular hole on the back of the machine. Whenever the nozzle has to be purged of its current filament in exchange for a new one, a little filament "poop" comes out the back.
How-To Geek
Your next 3D printer may be "poop-free," but that's not necessarily a good thing
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