3DPrinting

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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.

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Is anyone using a peltier dehumidifier in a drybox? (self.3dprinting)

submitted 11 months ago by overzeetop to c/3dprinting

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I'm reconfiguring my printing closet (~6'x6') for a new printer and thought about enclosing the printer in a moderate sized cabinet (~2'x3'x6' - one "shelf" of the closet) for thermal control. Since there will be inevitable opening and closing, as well as just normal infiltration of the ambient air (usu ~65F between 40-75% RH) it would seem like a good application for a Peltier dehumidifier to keep the RH in the chamber low and reduce my need to re-dry filament which has been on the machine during (inevitable) multi-day or -week downtime between projects.

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[–] [email protected] 1 points 11 months ago (1 children)

I have some TE modules that run at 10W or so and can cool 250mW at I think -50°C to -70°C so they can be awful.

[–] [email protected] 1 points 11 months ago

I see. You have a huge delta-T there, which is unnecessary for keeping a filament box dry.

A couple sources say PA6 (a random moisture-sensitive filament) should be stored below 20% , or at 15% relative humidity. In a 66f/19c room temperature, that 15% RH would be a dew point of 17f/-8c according to dpcalc.org. In a 74f/23c room, 15% is a dew point of 23f/-5c; as you warm up the temperature further the dew point to achieve a particular RH increases (which is why we heat air to dry things).