PolyDryer dessicant dryer
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A box and lid for drying dessicant on top of a PolyDryer.
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Informacje o modelu
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- Printables
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- Accessories
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- Creative Commons — Attribution
Printing
Filament choice
The box and lid will be exposed to relatively high temperature. I originally planned to use ASA for them and you probably should to be safe.
That said, while prototyping I used a transparent PETG for the box (to peek at the dessicant color) and a temperature color changing PLA for the lid (to check for cool spots). The box top wall deformed quite a bit but as a whole the box remains functional. The PLA lid didn't deform much (the lid is thicker than the box walls) and the lid/box fitting still works well. So I never printed it with ASA in the end.
For both the lid and the box, the printing area is quite large, avoid filaments that you know tend to warp on your printer.
Box
Print the box on its side (the vent openings should be vertical). The only support you should need is for the top of the 2 vent openings. Tree support worked great for me.
Lid
Rotate it for the large flat side to be on the bottom.
Using
Dessicant support
The two drying zones have walls with an array of small vents to let the hot air pass through (3mm diameter hexagonal holes). If your dessicant pieces are > 3mm in diameter this is ok. Smaller pieces will create a mess, passing through the small holes to the intermediate chambers sitting above the PolyDryer vent holes.
Loading
I'd advise using a funnel to load each of the two drying zones. For quick drying, from experience you should probably fill these zones only to a quarter of their height. Over half of the height and you would probably not get a consistent dry even after half a day.
Put the lid on, it is designed to be press-fitted : just put a small amount of pressure over the whole perimeter until it feels solid.
Rotate it to the correct orientation for placing on the PolyDryer (vent holes on the bottom), then lightly shake the box so that the dessicant isn't packed against what was the bottom before rotating it.
Drying
Use the highest level on the PolyDryer and change the box orientation halfway through to invert the air flow. If you didn't overload the drying zones, you should get dry dessicant in about 3 or 4 hours total. The more dessicant you pack in the box, the longer the dryer will have to work and the less even the drying will be.
Unloading
The box is a bit cumbersome to unload in a small recipient. I advise using something with a large opening and orient the box with the longest side up to avoid spilling dessicant everywhere. Some of the dessicant will fall in the intermediate chamber between the vent hole and the drying sections but it is easy to remove them when the drying sections are empty.
Design choices
The size of the box fits my needs and I don't think a significant taller or shorter one would have great advantages : it is about the size that the PolyDryer can handle.
The PolyDryer isn't designed to dry dessicant (usually 110°C is what is recommended but the PolyDryer highest setting is far below at ~70°C). So it can't dry as fast and probably not as deeply as some dedicated solutions and using a larger box will most likely reduce the drying speed even further. At some point the box would be so large that the heat losses would make it worthless.
The drying area has been divided into 2 sections to maximize the dessicant surface area exposed to hot air. Initially I tried more sections for more surface area but it made removing the dessicant very cumbersome.
The shapes of the perforated walls are designed so that the top section gets more airflow as it has more volume.
Fillets are used to avoid sharp corners during printing and chamfers are used for the interface between the lid and the box to make press fitting easier.
Original CAD file on Onshape
I usually work with OpenSCAD or FreeCAD but I'm currently learning to use Onshape. I usually avoid proprietary software but as a beginner I find the learning curve of Onshape far easier than the FreeCAD's one (and I suspect learning Onshape will help me understand FreeCAD too).