In case anyone missed it, we have an interesting new dehumidifying technology out there: solid state electro-osmosis or ionic liquid exchange.
BigClive.com has a video on it:
https://youtu.be/Vabq-s62IVM
But they come at price with their best performing unit (29gr per day) costing €409.
Yeah, CNC Kitchen saw that video and then did one of his own on it too. Why he bothered after knowing the price is beyond me.
These are yet another, less expensive method that’s popular with people who use gun vaults:
https://www.amazon.com/GoldenRod-Dehumidifier-Installation-Operation-Prevention/dp/B00D1WYXR0?th=1
Not sure which is more effective for filament, but I’d be curious to know.
First of all (as disclaimer), I do not have a lot of unopend Fillaments and wet filament is still a very rare occurrence for me - mostenly if I open one, it will by gone at least after a week if it goes into a AMS - if it goes into a M5, its properly gone in the worst case after 2-3 days (and only a handful of filaments survive 6 months or more, which I print very rarely).
TPU Transparent sometimes takes a little longer to use - but then it is resealed with an 80 USD vacuum sealing machine and finish…
New filament can be “wet”, I believe the people who experience it… but is unknown to me at all and when the time comes and it will by happen to me, I can deal with it.
I was thingking several time on a soluten like the following - it`s not really an AMS at all but the way he goes is the moste intressting at all: Get the hot printer Air on the Fillaments which you use next… But since I don’t know how long the X1 will be there (I don’t have a crystal ball), I’m still a little afraid of the effort to make this idear happen to my X1and M5 Pro…
It’s just a heater. Although so are some of the filament dryers.
To be most effective the moisture/humidity must be vented out of the container (or safe, transformer room, aircraft, etc) or absorbed by desiccant so that it is concentrated away from the objects that need drying out.
A desiccant supplier that I contacted told me that their biggest clients were electrical contractors who placed kilograms of the large, gel, colour-indicating balls in outdoor transformer boxes. They said the gel balls were the most popular of the different desiccant formats, although normally supplied in large, porous bags.
CNC Kitchen commented on the high price of the solid-state electro-osmosis driers, but his test showed them to be the most effective single mechanism: https://www.youtube.com/watch?v=n7EWexck8NE
Be careful with those. Some of them actually get pretty hot, and since there’s no fan etc you can end up with hotspots.
I have an 18" Goldenrod in a large safe in my garage. During the winter, when the garage is at or near freezing, the inside of the safe remains in the upper 50’s low 60’s (My safe thermometer is F and I’m too lazy to do the conversion lol)
I thought about a similar setup for filament but the high heat worried me.
There’s another company that has one with a fan but I found enough reviews that mentioned they caught fire that I haven’t pulled the trigger on one.
https://www.amazon.com/PEET-Dryer-SafeKeeping-Dehumidifier-Cabinets/dp/B00486U71E/ref=sxin_15_pa_sp_search_thematic_sspa?content-id=amzn1.sym.cd4900ae-382e-4968-8cca-26c773a2a0f3%3Aamzn1.sym.cd4900ae-382e-4968-8cca-26c773a2a0f3&crid=1ZG0BV5JPS8G4&cv_ct_cx=gun+safe+dryer&dib=eyJ2IjoiMSJ9.sIR4u3wG26vOdnWlyqs37nJLHG1zSf5R9Ziz_-w5BFN4D6UpEDIVyZYf-Qa_5cVwSd_AoQNJ3muO6NRyZccnXA.W325yG3uFke6zsnHbLqHZpUK3RPNqWGjFgMLD2NGzJI&dib_tag=se&keywords=gun+safe+dryer&pd_rd_i=B00486U71E&pd_rd_r=dc8b6033-9bc2-4055-8cca-115ab1d9d135&pd_rd_w=kLovL&pd_rd_wg=TGAYj&pf_rd_p=cd4900ae-382e-4968-8cca-26c773a2a0f3&pf_rd_r=Y2WJDQXY5ACFS7PKHCK6&qid=1711503193&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sprefix=Safe+dryer%2Caps%2C323&sr=1-2-3f7eb011-4703-48ad-8058-43dbff1e6b87-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9zZWFyY2hfdGhlbWF0aWM&psc=1
Hopefully the price on this technology will decrease. This is what CNC Kitchen tested and rated most effective.
Combined with some desiccant to maintain low humidity once extracted, a winning combination.
The description at https://www.micro-dehumidifier.com/rosahl/what-is-rosahl/ is interesting:
Rosahl dehumidifiers work by electrolysis when supplied from a suitable 3V D.C. power supply. They act like an ionic pump to remove water vapour at a molecular level, without involving liquid water.
Importantly, no liquid water means no cleaning, no draining and no maintenance. With low running costs, they are suitable for use in remote locations, and where a conventional dehumidifier is difficult to maintain or to service.
I use the bags as well. Unfortunately, the pump broke just after a few times using it. I printed an adapter for our vacuumer but it was to weak 
I’m following the trail you blazed and ordered a bunch of ZTH05 Zigbee TH sensors. The exact same Xiaomi TH sensor, but in bluetooth rather than Zigbee, is generally less expensive, so I also ordered this gateway:
on the hopes that it can capture bluetooth TH sensors in addition to zigbee TH sensors and somehow pipeline the data into Home Assistant as its gathered. On the other hand, if the Tuya phone app can graph the bluetooth sensor data, that’s good enough for me. Gateway or not, I’m hoping that there’s an informative Tuya app to go with the bluetooth/zigbee Tuya TH sensors.
I ordered the gear this morning, so it will probably take something like 2-4 weeks to get delivered here. I get the impression that it may be aliexpress that does the shipping for products such as these that it has “curated,” similar to the Temu shipping model.
Let me know, how it’s working.
Since someone posted a stackable single-spool food container, I’ll add that I also use these for some of my spools, and they fit perfectly, have lid clamps, and a seal.
At what price are you able to source them at?
When I bought mine off Amazon in 2018 the first was $12 and then I got four for $9 each. I don’t currently see that size available.
I actually used them for printing from, not storage, so I designed a brace and a thrust bearing (and a shelf) and didn’t need more than 5.
I was going to PM you about this, but your profile is hidden, so I see no way to do that.
How long do the batteries last? They are CR2032, and I think I may have read somewhere that they may last only two or three months!?! Please let me know. If that’s the case, then I’m going to wire them up to a battery with more capacity, like maybe 2 or 3 AA’s.
By the way, the “MOES” app that works with the gateway I bought is incredibly invasive. It wants access to all my financial transactions, all my telephone contacts, all my email contacts, all my pictures. Literally everything. I see no justification for that. IMHO, it should stick to reading temperature and humidity, not phoning back to China with a datatrove. It’s rating in google playstore is also low. I smell a rat; I don’t trust it. Rather frustrating to say the least. I’m disappointed that Tuya would partner with a dodgy vendor like that.
Mee too. Maybe I had set - but I didn’t remember - the option to hide my “public profile …”. But users are allowed to message me. 
I’ve installed the system in last August and now the first sensors send notifications about low battery. But this are “Tuya Emoji Climate Sensor ZG-227ZL” sensors. I have found the ZTH05 in november. So I don’t really know how long will last. But I expect at least 6 months.
This is the reason I have choosen the Zigbee sensors. It runs with any Zigbee-infra structure. And in my smart home I have Zigbee2MQTT integrated. So it was a easy to integrate the sensors and show the statistics on a Grafana Dashboard.
Costco has clear plastic boxes with tight sealing lids.
Exactly which ones are you referring to?
Really? That’s a revelation, I had never heard that before. That’s hard to picture in one’s mind… I also heard a rumor, but please don’t quote me on it, that Costco sells other stuff too. 
I just found out there’s an interesting alternative to digital humidity sensors. You can buy humidity indicator strips at about 50 cents each to indicate the humidity level inside. I had always thought such indicators were one-time use, but these newer ones are re-usable and track humidity even as it changes. Of course, this assumes you use a storage container that you can see through to the indicator strip inside.
