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What would be the minimum humidity level for good filament storage, ok, I know as low as possible right?

So if I have a dry box at what point is the humidity level no longer a real factor? 50% 40, 30?

I also imagine like a lot of things if the humidity is to low it might not be good also.

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Hi

I store my filament in a 5 gallon bucket with desicant.

Humidity level in my bucket is usually about 21%

I think this a difficult question because I have not seen anyone who really would know chime in here.

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This is just what my conditions are.

They seem to work for me.

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Thanks for the input. I was just wondering for instance if my closed container is maintaining 50% compared to 70% outside if that is ok. I know the lower the better but I think there is a point where it may be to dry also.

Just was wondering what people thought on the subject. Nothing to scientific!

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Hi again.

From my point of reference 50% humidity would be about as wet as I would go.

The only reference I have to this, has to do with vacuum forming petg sheet plastic.

If I would store my petg sheet at 50%, when sheet was heated, small blisters would appear.

If I would store my petg sheet at 60%, when the sheet was heated, lots of small and medium size blisters would appear.

The blisters are caused by the water content in the sheet going to steam.

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When 3D printing, if the filament is too wet, the water component will flash to steam in your hot end.

This causes blisters and gaps in prints.

I’m quite comfortable with my filament stored at 20 to 25% in the desicant.

However, I think I would need to be very careful about Taulman 910 material, or polycarbonate.

Those materials, from what I’ve heard, need to be very very dry before using them.

I have found no information at all for storing any plastics at very low humidity.