Has anybody used one of these mini "dehumidifiers" to dry out filament as a substitute for buying a bunch of the desiccant beads? My filament seems OK, but I could do better to keep it dry.
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On a related question, is "desiccant refresher" a thing, as in a reasonably small device that will heat a small quantity of those beads to something like 120ºC while keeping a slow air flow?
The one in OP's picture is one such device. You plug it directly into the wall and it heats up. No fan though, just passive convection
Oh, so the OP's question is about using recyclable beads instead of single-use ones?
I though it was a machine that forced air into the beads.
I didn't realize that the desiccant beads were able to be dried out. I thought they were single use. I have a bunch in the bottom of a Rubbermaid tote with a rubber foam sealed lid along with my filament. I don't know how to tell when the beads are "full" and started thinking about a more recyclable approach. After thinking about it a bit, I should probably get a humidity meter.
The ones that are sold for single-use tend to break into pieces when they absorb too much water.
The ones intended to be reused normally have some mechanism to tell you they are "full", like changing colors.
I had good results with microwaving a bunch of beads in a microwave safe non-plastic bowl on mid-low.
It drives out the moisture, and you can see the bead colour indicators change.
But be careful, they’re hot!
Also if you're using blue indicating silica gel, NPS recommends that you wear gloves, lab coat, safety goggles and respirator with HEPA when handling it. I'm guessing they'e talking about larger quantities, but you probably want to minimise any amount of cobalt chloride you inhale or get in contact with your skin.
That looks like it should work very well. I will certainly try.
you can dry them back out in an oven, or in a food dehydrator. I dry my desiccant out when I put filament through the dehydrator (the dehydrator takes out most of the moisture- especially on things like TPU or PETG- the desiccant takes the rest out- and keeps it out)