The number of photos I’ve seen of completely melted filament rolls, due to either poor oven thermostats or inattentive users … I cannot endorse this technique.

If you’re on a budget, probably better to just power up your heated bed, with a box over top, and dry your spool inside there.

Repurposed food dehydrators seem to rate highly, if you can find a used one for cheap.

I ended up biting the $40 bullet and grabbing a Filadryer S2 when it was on sale.