RecycloHippo - recycling desiccant dehumidifiers

by Wauter, published

RecycloHippo - recycling desiccant dehumidifiers by Wauter Aug 3, 2012


This thing is part of an instructable on how to recycle spent desiccant dehumidifiers. (the kind with the hygroscopic calcium chloride salt inside) They are frequently used around the tropics to keep moist out of cupboards and storage rooms, but quite a few makers use dehumidifiers as well to dry out filament before printing. If you are interested in recycling your spend calcium chloride desiccant dehumidifiers, check out the instructable too: http://www.instructables.com/id/Recycle-desiccant-dehumidifiers-Thirsty-hippos/

This dehumidifier is constructed out of breakfast oats containers with some printed parts. It's meant to be hung by the handle in a cupboard, to prevent it from ever topping over.

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Find one of these containers, or similar.

reservoir.scad relies on meshscreen.scad to generate its mesh bottom. The scad files are fully parametrized and can be tailored to fit a different size containers.

Tweak the setting of the mesh screen to fit your printer settings. It is a good idea to set the with of the mesh threads to a multiple of the width of your extruded filament. Idem ditto for the mesh height: set it to a multiple of your printers layer height for best results. I print with a layer height of 0.3 and a width of 0.45. My mesh is set to be 1.2 mm high, the threads are 0.45 mm wide and spaced apart 2mm. It works really well for me that way.


Cut open the top of the container.

Adjust the mesh screen to fit your container and print.

Adjust the container to fit your container and print. Print the 4 legs as well.


Add calcium chloride.

hang in cupboard/ put inside an airtight container together with your filament.