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How much did the printer and materials cost? Or the time to educate on cad and printing?
Just saying, it was likely far more money and time/effort than merely 12 cents.
If you didn't learn it only for this project, that cost is already sunk regardless.
Either way the post itself contains the answer for those who haven't already sunk that cost.
Also, aren't ovens hot? Won't a 3d printed part melt straight away, or is there some special material?
I don't think knobs get very hot
Well crap. Here I was hoping my knob would get hot.
Depends on the material. ABS would be a decent material for this application - as long as you have a decent enough setup to scrub / clean the air in the chamber / room.
PLA would have a hard time in that position, PETG might be OK, Nylon may creep after too many heat cycles. Depending on how hot those parts get this is.