Author Topic: somoene finally built a solid state dehumidifier based filament housing  (Read 5184 times)

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Offline coppercone2Topic starter

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we have been talking about it for god knows how long but no one has the balls to buy the membrane and actually mount it to a box!!!, until this guy did. must have been like 6 eevblog humidity congresses held up to this point

« Last Edit: February 24, 2024, 11:49:23 pm by coppercone2 »
 

Offline DavidAlfa

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Re: somoene finally built a solid state dehumidifier based filament housing
« Reply #1 on: February 25, 2024, 09:31:33 am »
The balls? Nope, maybe you meant the money.  That thing costs about $150.
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Offline thm_w

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Re: somoene finally built a solid state dehumidifier based filament housing
« Reply #2 on: February 26, 2024, 11:12:11 pm »
He showed the cheap ones are $10-20, but presumably it would take months for it to dehumidify a wet roll of filament.
https://www.micro-dehumidifier.com/products/price-list-rosahl-dehumidifiers/

Seems there is just this one company making them, no cheaper alternatives?
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Offline mawyatt

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Re: somoene finally built a solid state dehumidifier based filament housing
« Reply #3 on: February 27, 2024, 12:41:52 am »
Interesting technology, but leaving excessive O2 around in a closed container will likely cause issues with some materials!!

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Offline all_repair

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Re: somoene finally built a solid state dehumidifier based filament housing
« Reply #4 on: February 27, 2024, 01:51:24 am »
leaving excessive O2 around in a closed container will likely cause issues with some materials!!

Very true, I have many drawers of parts to protect from corrosion.  Reduce moisture but introduce more O2 shall cause more harm than good.
 

Offline Marco

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Re: somoene finally built a solid state dehumidifier based filament housing
« Reply #5 on: February 27, 2024, 10:28:15 pm »
I wonder if a box of silica gel, a heater and some a solenoid controlled vents wouldn't be faster.
 

Offline thm_w

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Re: somoene finally built a solid state dehumidifier based filament housing
« Reply #6 on: February 27, 2024, 11:32:38 pm »
I wonder if a box of silica gel, a heater and some a solenoid controlled vents wouldn't be faster.

Heater is obviously faster, as was noted in the video, but energy costs are high right now for some countries, so they are avoiding that solution.
I'm sure a 3W heater would not work as well as this device.
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Online NiHaoMike

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Interesting technology, but leaving excessive O2 around in a closed container will likely cause issues with some materials!!
Then put something inside to use up the oxygen without generating moisture? Carbon comes to mind as something that's cheap and readily oxidizes, the tricky part is figuring out how to do that in a well controlled manner, without generating hazardous amounts of CO.
Heater is obviously faster, as was noted in the video, but energy costs are high right now for some countries, so they are avoiding that solution.
I'm sure a 3W heater would not work as well as this device.
How about a simple solar thermal collector?
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Offline chip45

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Hey all,

I made a cereal storage box based filament drybox with the smaller RS1 membrane from Rosahl. Works pretty well for keeping new (fresh unpacked) spools or pre-dried spools (lying around for days/weeks before) at 15% rel. humidity (compared to 60% outside in my region). And consumes just 0.2W power at that level constantly. Made a bunch of 3D printed parts for it and it's powered from USB. See on Printable.com if interested: https://www.printables.com/model/889550-filament-drybox-with-rosahl-rs1-electric-dehumidif

I also grabbed a larger M-3M1R membrane which currently keeps a 50l storage box with 15 spools at constantly 15% rel. humidity. Also made a 3D printed mounting cover with USB supply but that's not yet on Printables. Will add soon.

Yes, these membranes are a bit costly but they are very, very efficient in the long term compared to regularly using some Sunlu filament dryer or even an oven to dry spools or recover desiccant. I use four of the RS1 based dryboxes with the filament types I use frequently which is still less than 1W of constant power.

Cheers,
ER!K
 
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