DIY Close Loop Control Filament Dryer

When printing with materials such as Nylon, PETG, or Ninjaflex, one can find that some of these filaments can be hygroscopic (absorbs water.. in this case, from the atmosphere). Once water is absorbed into filament, the print quality and ease of printing can plummet and make for some pretty miserable prints.

One way to dry filament is to put it in an oven. This is great if you want to spend the money on a food dehydrator or your spouse doesn't mind you putting plastic into your nice new kitchen oven. However, one other way it to use a chamber and a light bulb. This method works well but different materials can require different temperatures due to glass transition temperature (the point where plastic begins to soften).

By using arduino, we can build a closed loop control drying box that works similar to your oven.

Set your max temperature allowed, your amount of temperature tolerance, the number of hours you'd like to dry and you're good to go. The controller heats the chamber