2 LBS Activated Alumina, Alumina Desiccant Great for Filament Drying, Reusable Dessicant Dehumidifiers Desiccant Moisture Absorber Prevent Wet Filament

This stuff is the magic sauce in my filament driers. I've printed a handful of desiccant containers to use in my various driers and filament bags, and this stuff has easily dropped my Relative Humidity numbers to sub 10% according to all the sensors.

This stuff is insane. I live in a very humid tropical zone with 75% RH and the AMS 2 Pro was constantly measuring around 25-35% with weekly 12 hours filament drying sessions at 60° degree C (silica only halfway dried)Immediately after replacing the silica with the alumina, the humidity started to go down. After a couple hours the AMS reports 10% and the same on the meter. Never seen such numbers before with the silica, I’m beyond impressive how well this stuff works.I still need to check after 15 days or so if they are still efficient. This is how long I would need to replace the silica with fresh ones before drying them. Supposedly the alumina can absorb more % of their weight.Cons:-When poured out of the container there is a small dust that can be picked up by air drafts, not sure how safe is this to be around with.-The beads seem to be quite fragile, not sure how well they can handle continuous handling and re-drying on the oven.-Expensive but not by that much

It's more expensive and has no color indication so I was skeptical when I got this but figured I'd indulge my bougie impulses and they were well rewarded.I got these for my 3d printer filament dry boxes and it's night and day. I live in the EXTREMELY humid S. Eastern US where the LOW, indoor relative humidity is in the 60% range. Filament starts stringing like crazy after a few hours in the open.To test efficacy I used the exact same desiccant holders and swapped out the silica for activated alumina. My K2 Plus CFS used to bottom out at 15% RH with 3 separate added desiccant holders plus 4 in spool ones. My dry boxes were 20%Just using 2 of them but filled with this stuff took me down to 5% and whenever I swap spools, it gets back down to 5 much quicker. My dry boxes go lower than the minimum 10% my cheapy hygrometers can read.If you're concerned about color indication, don't mix the silica but instead they also sell RH test strips you can use.However what I've found by switching to this is the color does matter. Add desiccant until you reach the desired RH. Whenever that begins to rise it's time to replace/recharge it. The part we care about is the humidity and for filament or electronics, the color indicator shouldn't be what tells you that it's too high.It's also easier to 'recharge' as the color used for indication is toxic while activated alumina is pretty much harmless.While it's more expensive, you get a much better value for the money which does a better job and lasts longer. The filament boxes show petg. I had honestly just thought my hygrometers bottomed out at 20% until testing the alumina.Plus this Wisesorbent is cheaper than the other options.

New to 3d printing and saw this recommended in the comments on a Maker World file for desiccant boxes to put into my AMS Pro2. I immediately liked the concept that it was reusable vs. consumable.I live in PA and have an old home that isn't sealed well. It's been rainy, hot and humid this summer (a far cry from AZ where I moved from last year) with my indoor humidity ranging from the 40s to the high 60s. I try to mitigate this with absorption catching containers throughout the house and a dehumidifier in my printer room next to my H2D.I purchased the 2lb one and once I filled the boxes and placed in my AMS I saw the humidity levels drop from the mid-30s down to the low teens. This took all of an hour or so. My printing has been MUCH better now that I have integrated the boxes with this desiccant and will be ordering more to use in the spool storage containers I will be setting up.

Perfect for my 3D printer filament

Works well. The only negative is that it comes in a poor quality container that is not suitable for reuse.

Before I was just using silica gel and the lowest RH I was able to get in my airtight filament container was 25%, but with this I was easily able to get to 10% within a few hours (at least according to my hygrometers that are pretty inaccurate). Work well with breathable bags, like organza.Great buy!

This is my new go-to desiccant for my 3d printing filament and gun cabinet needs. It seems to absorb much more moisture than Silica.The drawbacks are that it doesn't change colors to easily identify when it needs to be replaced or recharged. Also takes a lot higher heat to recharge than Silica, so for many it will be single use.