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I bought some TPU to try out, but I read that the stuff needs to be kept dry, more so than PLA. I just keep PLA in bags and am not really good about monitoring humidity (but I have found that it seems to recover pretty well in a dehydrator). I checked around for filament boxes, and it looks like people use the rubbermaid cereal storage containers for single rolls, which should be air tight. One of those, and some silica gel beads should work out OK, but I want to keep the filament in the box while it is being used. That means I need to have a way to get the filament out of the box. I saw something like the design above on thingiverse, but I could not find it when I went back to locate it. Once I find it, I will add the link (UPDATE - here it is) , but for now, this is what my version of a filament pass through is looking like. It will have a screw on cap for storing the filament, and there will be an o-ring inside the cap, along with a place for another one on the back plate. I expect that I will need to use silicone around the screw holes and on the front plate, but the combination of o-rings and sealer will hopefully keep the box air tight when stored with the cap.
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