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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
I got the eibos cyclops, it works amazingly but it's not cheap.
I have a couple S1s that I like. They don't have a built in fan or hygrometer like the new ones, but they seem to work. You can print mounts for cheap hygrometers if you want (not necessary but interesting to see the humidity change with the dryer running). I usually run the dryer with whichever spool I'm using when printing and it seems to keep the filament in good condition.
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.
A food dehydrator or the purpose built Sunlu would work great for this purpose, but in my opinion there are easier procedural ways that don't require additional appliances.
I just keep my spools in a large sealing storage tub with an oven safe tray of loose silica desiccant beads at the bottom. Every few weeks the tray of desiccant gets put through a heat cycle in the oven (about 150-75 for 10-15 minutes) and goes right back in the bin. You really only have to fight the moisture that gets absorbed by the spool while on the printer before going back in the tub, and the moisture within the air exchange every time the tub is opened.
Keeps my spools nice and dry without much fuss.
I do something similar. I keep mine in large zip lock bags I got from Ikea with the desiccant packs that came with the spool. These spools then all go in a large Rubbermaid container (which holds 13 1kg spools) so they're doubly sealed and all packed neatly in one place.
I just keep my spools in a large sealing storage tub with an oven safe tray of loose silica desiccant beads at the bottom.
This, but I use Damp Rid, which is quicker to replace and not that expensive.
Also, I have an Inkbird temperature/humidity sensor in there to check the status without opening.
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.
I have the Sovol 2 roll dryer and it works well. Only complaint is the touch display, needless. I print in my garage, mostly due to the particulate matter from FDM, so I usually dry my rolls before a print.
I have a cheap food dehydrator i got on Amazon and it works fine. I mostly use it when I have multiple spools to dry, o if I have a particularly saturated spool. I will run for a few hours in the dehydrator and then move to spool dryer.
I had sain smart dryers, but i really didn't like how you set the temps. Instead of specify the temp, it had level 1,2, and 3 and depending on the number it meant a different set of filaments. I lost the manual at one point so I could never remember if ABS was 2 or 3.
I replaced that dryer with one from Tecbears.
https://www.tecbears.com/product-page/filament-dryer-box-white
It was a deal i found online at one point and I think it was $40 at that time ($20 off). I like it because you specify the temp you want it to heat up to. It has 2 heat elements so it heats the top and bottom of the spool and it has a readout for the current humidity inside the dryer. My only complaint with it is that it only goes to 70c. I had spools of ASA that say to dry them at 80c and I don't have anything that goes to that temp. I left it in the tecbears dryer for 24hrs at 70c and it seems like it printed better than it had in the past.
Get the cheapest food dehydrator that still fits your spools. You will have to cut out the middle of the racks. Also get yourself a thermometer. In my experience the dryer dial is off by 10-20 degrees centigrade.
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.