Filament dryer humidity. Help!
Hello so I just got a sovol sho2 filament dryer and so I have been drying for 3 hours and the humidity is stuck at 32% it doesn’t go down. It just stays that way and the room is 33% humidity what is wrong?
RE: Filament dryer humidity. Help!
Is the temperature in the dryer appropriate for the filament type? e.g. 60C for PLA
Is there a small hole to release the humidity to the outside somewhere? Some dryers have been reported to have this hole blocked (and don't mention it in their manuals).
Prusa MK4 since Jan 2024, Printables: @MikeB_1505898
RE: Filament dryer humidity. Help!
Yes there is a hole and it is not blocked it is open. I have it set to 45c for pla.
RE: Filament dryer humidity. Help!
Do you have another humidity sensor that you can put in the dryer to confirm that the built-in sensor is actually working?
Prusa MK4 since Jan 2024, Printables: @MikeB_1505898
RE: Filament dryer humidity. Help!
Yes I did that. Both are the same.
RE: Filament dryer humidity. Help!
You may happen to live in an area where the current drying is not powerful enough to drop it lower, because the ambient humidity is very high.
I suggest checking local weather station readings.
See my GitHub and printables.com for some 3d stuff that you may like.
RE: Filament dryer humidity. Help!
I'm out of ideas - as long as there is a) heat in the chamber, and b) lots of airflow, and c) a small hole to let moisture escape, you should see a decrease in relative humidity.
Prusa MK4 since Jan 2024, Printables: @MikeB_1505898
RE: Filament dryer humidity. Help!
Open the lid and prop it on the fastener lock, it's held open about 10cm or 1/2" that lets the humid air out a lot better than the stupid small hole in the top that is clearly not enough. I made some wedges to prop the lid when drying, in the older model it mentioned in the instructions to crack the lid open when drying and once dry clamp the lid and top opening closed.
RE: Filament dryer humidity. Help!
Maybe it's simply that the filament is still releasing humidity. While that is ongoing, the air humidity inside the dryer will be at a dynamic equilibrium -- some humidity is released into the room air, some it added from the filament.
Either just wait for a few more hours -- eventually the humidity inside the box should drop significantly below the level in the surrounding, cooler room air. Or, if you want a quicker check: Remove the filament spool and see whether the empty dryer can drop the humidity more rapidly (due to no more water being added from the filament).
RE:
I think the main problem is the humidity in the inside air is not getting evacuated fast enough(In my case)
With the dryer running and only the top vent open if the filament is wet you will see condensation forming inside the lid, wherever it comes from as soon as you stop the dryer the filament will just start to absorb it again. The condensation leads me to believe the damp air is not getting evacuated fast enough, If I open the lid for a second or two the humidity drops like a brick.
I'm thinking of cutting a big hole in the top, 30 or 40mm and printing some sort of variable air vent, first I will completely remove the top vent and see if it makes things better and print a TPU bung to close it for storage. If that does not work I will go bigger till it does work.
My average humidity is about 60- 65% so any filament left out will become unusable if not used in a couple of weeks so definitely will need drying, that's why I bought the dryer. After reading a few reviews, for the price it seamed like the best bet without taking out a mortgage.