What exactly is happening here?

Just got a p1s with ams. I have printed a couple things and seemed to work fine. I started printing this mouse kit that cane with the printer and got this. What could cause it? I noticed my nozzle was picking up some debris so just cleaned it.

I have some of those same artifacts on my mouse cover. It comes from printing with filament that has soaked up moisture. It snowed here, the wet heavy stuff, and I printed anyway. I like the color so I probably will keep it for a while.

Dry your filament and you should have better results.

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I put it right into the ams after opening it. The ams has the little drying bags in it. Do i really need to take the spool off and dry it every time i print?

Yes!

There’s no guarantee that a factory sealed package of filament will have a low (enough) moisture content. See THIS POST for details.

Bambu has minimum filament drying times and temperature recommendations that should be followed.

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Do i really need to take the spool off and dry it every time i print?

Not necessarily before “every print”, but if the filament has been sitting for more than a month, yes.

Unfortunately the AMS desiccant can’t “dry” filament, all it can do is keep the spools from gaining moisture as quickly.

Starting with “dry” filament is a good troubleshooting step (even for PLA).

For myself, I don’t trust any filament that didn’t arrive in the “foiled” style packaging (which seems to keep moisture out much better). Every spool goes into the dryer overnight before I use it for printing. It reduces stringing, surface artifacts, even bed adhesion can be helped by drying.

Ok makes sense thanks. Can i use a clothing dryer or does it need to be a special filament dryer?

Probably hard to regulate clothes dryer. I use a food dehydrator.

First time I ever tried to dry my filament was in an oven, set to a very low heat. That roll turned into a solid wheel of plastic.

Ahaha, point being. You’ve gotta be careful and need a device where you have better control over the heat output. Food dehydrator is a good option, as CRracer712 mentioned.

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IMG_9989

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I use THIS little food dehydrator.

Two 1kg spools fit nicely (with no racks installed) and it works perfectly. The digital temperature selection and control seems accurate as confirmed with an IR thermometer. It has a magnetic door catch.

I typically dry each spool that I plan on using for a minimum of overnight. I just set the timer to 24 hours and let it go until I’m ready to load filament on the printer the next day.

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That’s the same brand I’ve got, different style but I’ve mine for years.

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I use an air fryer with a food dehydrator settings. I verified with a thermometer that it ran about 3 degrees Celsius high, so I adjusted for that.

It keeps within 2 degrees of the set temperature very reliably.

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