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Obviously not something anyone should do, considering the many Microplastic Filled Reasons... but curiosity wise, would it Theoretically be possible?
I mean you can cook on an cars engine exhaust (tho good luck finding a place now they the engine bay is just plastic covers) or cook a fish in a dishwasher (wrapped in tin foil)
Anyone remember that video of a guy proving he can cook chicken by slapping it many times?
Could you? Yes.
Should you? No.
theoretically? yes.
several problems.
Food dehydrators typically apply heat as well, and sometimes significantly higher than a filament dryer.
Then there's the cleaning and bacterial contamiation issues- food dehydrators are made to be easily cleaned so as to prevent bacteria doing nasty things to you.
Then there's the various resins and solvents that sometimes off gas becoming toxic.
Microplastics is far down the list if you're desperate, but it's there too.
but otherwise, they're still basically the same device A heater (maybe) pushing warm(ish) air over something.
I do the opposite use a cheap dehydrator to dehydrate my filament. I don't own a filament dryer, because I bought the dehydrator before commercial filament dryers existed, so I can't comment on the inverse.
I would fear the bacterias. Bacterias love temperatures between 40°C and 50°C. I don't know about the typical temperatures of Food Dehydrators. But filament dehydrators are targeting these temperatures.
Anywhere from 35C to 75C depending on what you are making. 50C is just about right for most vegetables and mushrooms.