Dehumidifier rod magnetic holder using 20x5x2 stick magnets
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Magnetic clips to add electric dehumidifier/heating rod to a printer enclosure.
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My MK3S was getting an ‘under temp’ error in a cold garage in the winter. Adding a safe dehumidifier helped keep the temp above the error threshold of about 50°F. The dehumidifier is essentially a stick-shaped weak electric heater. These are commonly sold in the US for dehumidifying safes. A 12" stick heater fits well in the prusa enclosure below the filament reel.
Friction keeps the magnets in place, and there are holes in each clip to push the magnets out with a hex key.
Designed for use with 20x5x2 stick magnets I had on hand. I found the 20x5x2 magnets to be a little smaller than spec at 19.5x4.6x1.7, so the opening size is set to those dimensions. I've included a parametric source file to make it easy to tweak the dimensions for other bar magnets.
The 20x5x2 magnets aren't really strong, so 4 clips are needed when mounting vertically as pictured. The weight of the dehumidifier cord drags it down. If your mounting on an enclosure lid or floor, two clips will probably do it. If you have to purchase magnets, I'd recommend not using this design, and instead going with the more robust Dehumidifier rod magnetic holder that uses 20x6x3 bar magnets, or modifying the f3d file to work with a bigger magnet.