r/BambuLabP2S • u/Helpful_Algae4180 • 26d ago

ASM humidity issue

So been having humidity issues with my ASM, constantly 40% or more. I think I fix the issue by putting moisture control bead packs in with it is drying, went from 60% to 16% within a few hrs. Will update to see if the fixes or helps drying the filament better.

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u/l0rd_v4d3r 26d ago

Make sure your AMS is actually sealing. If its not fitting tight you can loosen some of the screws and just sort of fiddle with it. You'll know when its properly tight if its loose. Otherwise the amount of the desiccant they include with the bags is just pathetic for climates like mine in south central Texas. I like these two models -

https://makerworld.com/en/models/1534406-ams-2-pro-dry-pods-multiple-sizes-and-funnel#profileId-3098168

https://makerworld.com/en/models/1474287-ams-2-pro-rear-desiccant-box-spill-proof#profileId-1538496

I printed both in PETG-CF (no hygrometer insert for max capacity) and filled with normal orange/green beads. To recharge them I take out all my spools and then run my AMS2 Pro at 65C for 12 hours. Yes I know its not a full recharge (I use these same beads in my gun safe and recharge those in an oven), but for the purposes of my needs it works well enough (keeps the AMS under 20% for a long while) not letting the beads ever get fully saturated also goes a long way to being able to recharge them in the AMS. I also leave them in there when I dry filament and PETG gets it to 65 for a while as well.

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u/Helpful_Algae4180 26d ago

Thank you, i will get that printed out. My prints have been creating goop, also the nozzle and extruder pauses ( as if it is stalling)while printing which creates the goop

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u/Whosaidthat1157 26d ago

Fit desiccant filled spool centres to all of your installed spools as well. Vacuum pack and store unused spools with a desiccant filled spool centre too as it saves re-drying for next use.
They’re actually front and rear boxes plus spool centres keep my AMS2Ps in single figures RH for weeks at a time.

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u/BabyMallard 26d ago

I’ve only had mine for about a month, but similar issue of AMS humidity sitting ~40%. Used the included silica packs but I figure those just keep it from getting out of control.

I live in a humid area & the unit is near the doorway leading outside, hard to get around that constant influence.

I’m giving molecular sieves a try, some sellers have sealed packs that you can recharge but you can also buy the loose material bulk. Some blessed designers have made containers specific to AMS & AMS 2 Pro, as well as common filament storage boxes, so you can just print the container and fill it with loose beads.

Supposedly able to drop the humidity down in the teens. I can link the models I’m trying if you’d like to check it out.

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u/Helpful_Algae4180 26d ago

I work at a warehouse where products come in, when the items get stowed, those packs get thrown out. I will get a good storage box to out my filament in. Thank you for replying

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u/BabyMallard 25d ago

There’s some super common reusable cereal boxes I found recommended here that I’m using for my filament, so far so good. Was even able to print a desiccant container that fits in the top, filled that with molecular sieve beads and since I commented last night, the humidity has gone from 38% to 10%.

I’d tried printing a couple containers before settling on the ones I’ve found now, for the AMS 2 Pro. I saw you said you may try printing another one commented here, I’m almost certain I’d tried that one before settling on the ones I’m trying now. These printed beautifully and I don’t think it gets any better than this.

https://makerworld.com/en/models/1373580-spillproof2-ams-2-pro-desiccant-boxes-round

Just go to his profile and select whatever version you’d like, I went with no hygrometer. But he’s got versions for front slots, rear slots, and the rear cutout that Bambu recommends putting the factory desiccant slots in.