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Like gas-money(sfw version), filament-money is when you pay for a roll of filament to a friend who 3d prints a model for you.
Hey, I saw this cool toilet paper holder on tiktok, I found the model on thingiverse, can you 3d print it for me. I got the filament-money.
Friend 3d prints the model and refuses to take filament-money when offered because they're your friend after all, but you pay them back by buying the next round anyway.