3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: [email protected] or [email protected]
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I still don't understand how those cheap filament dryers work: they fully enclose the spool and heat up the air for a few hours. But where does the moist air go? It's still trapped in there with the filament. It makes no sense!
I always leave the filament dryer a bit open so the warm air can escape, taking the moisture to a better place (far away from the filament)
Humidity is relative, not absolute. Air's carrying capacity for water increases as temperature goes up, even if the total amount of water in the air is the same.
Air with 50%RH at 70F (eg, it has 50% of its max water content) only has about 10%RH at 120F. So if you get the filament hot, it gets dry. This can be improved with outside air circulation i guess, but it's not necessary and usually causes extra energy use due to heating the makeup air.
That I am aware of. But without any circulation the hot air will simply cool down and condensate once I turn off the dryer, wouldn't it? Leaving either highly saturated air or even some water droplets, ready to be absorbed by the filament again
This is true. If you left it in the same environment it would eventually return to equilibrium and the net result would be the same. the key is that the plastic has a limited take up rate of atmospheric moisture. so if you dry it for a few hours, the water migrates out slowly, but then takes quite some time to migrate back in.
generally people either print from a dryer box or dry filaments immediately before printing.
Now that you mention it, I have no clue! There's no exhaust fan on mine. It definitely works though, so I assume the people that made it are smarter than me.
You're supposed to put some type of desiccant like silica gel beads that will pull that moisture out of the air.
Leaving the box open will just let humid air in. You can't let air out without also letting air in unless you have some sort of vacuum pump.