If you’ve printed to an FDM printer, you probably know that there are many interrelated factors that make a good print. An important point is the dryness of the filament. The first time you break open your plastic it should be dry. Most filaments are packaged in a sealed pouch with desiccant. But if you leave the filament outside for a while, it will soak up moisture from the air and that causes a lot of problems. [Design Prototype Test] has built and bought filament dryers before, but now would like to point out that any FDM printer with a heated bed can function as a filament dryer. You can see the details in the video below.
It turns out the idea isn’t original, but it doesn’t seem like one that caught on. What the video shows, however, is to take the idea and move on with it. A 3D printed support sits on the bed and houses a cheap PC fan. The whole thing is packed with cardboard and the filament can dry.
The first test worked fine, even though the carrier was made of PLA and did not survive well. An ABS shoring tower was the answer. We were hoping there would be STL files for support, but apparently they are only available to the supporters of the channel. However, after a few minutes in any CAD program, you should be able to easily duplicate the support.
The video mentions that the cover box could probably use more insulation. We would have been tempted to line the box inside and out with cork, which is easy to work with and a great insulator. If your printer has a heated build chamber, you don’t need the box anyway.
The video concludes with storing filament so you don’t get moisture in it initially. He mentions vacuum chambers and reptile heaters. We used a sealed container and a few pounds of unused crystal kitten litter which is just a cheap way to buy silica gel.
We saw [Richard Horne] Building a dry box years ago. Dehydrators also seem to work well.