I haven't tested this myself, but supposedly you can make a dryer using a cardboard box and a heated bed: https://www.youtube.com/watch?v=WC3jvuq-uq8
Adding a fan to circulate the air probably improves energy efficiency: https://www.youtube.com/watch?v=H1DoJxY6v_U
Thats pretty cool. I wish I knew this before I bought my Sunlu. I used to use my toaster oven that had a food dehydrator function, but my so got tried of me using it for hours. I had to get a dedicated dryer.
I have Sunlu S1 dryer. I added fan and changed thermistor position. I tried it with PLA, PETG, ASA with good experience. S2 have two heater plates, touch display. But for me, it have filament out way in bad position.
With all the rain we've been getting the past month I'll probably need a dryer too... I heard an oven works pretty well in a pinch.
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.
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