Does anyone have a US-based source for these parts? I’d love to do a better job of keeping filament dry. These look interesting. But cross-the-ocean shipping for onesies is often discouraging.
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Not sure which one you are referring to but here is a quick Amazon Search
Sorry, no. This is a very different design from anything on Amazon. It’s a very specific part. It basically actively moves humidity from one side to the other, and so would be installed in the side of a dry box and then you would never need chemical drying agents or silica gel.
Thanks! It looks like those are gas-driven, either positive gas supply or vacuum, whereas Rosahl have electrically-driven membrane dehumidifiers. Electric membrane dehumidifiers seem to me probably a better choice for a hobbyist.
[Edit: fixed the topic description to be clearer…]
That’s actually a pretty nifty bit of tech. They are using electrolysis to break down the water and transporting the resulting hydrogen ions across the membrane, sort of like a fuel cell, and then reducing the H+ ions back to water with atmospheric O2.
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@mcdanlj -
Did you continue this exploration / project? I’m looking to build a dry cabinet of my own for my filament. I’m printing more HTPET, and it’s time and energy intensive to periodically dehydrate it in the dehydrator. A few friends purchased cyclically recharged dryboxes, but I too am interested in building out a Rosahl membrane box. Curious if you ever found a US source for the membrane. Thanks!
I never did. I just recently purchased and have not yet deployed molecular sieve dessicant to replace silica gel, at least as an experiment.
I wish I had, though!
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Well, now I know how much it would cost. Now that I have 8 storage dry boxes, that would be over $1K!
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As an aside; I get my silica gel from the pet supplies store.
It’s sold as a absorbent kitty litter at good prices, my cats hate it, ymmv.I use a very fine linen bag for it since the (silica!) dust is an issue with the big bulk bags sold for this.