To dry the filaments, you put them in a electric oven at something like ~40°C (~100°F) for a few hour. The details depend on the material and other details I'm

To dry the filaments, you put them in a electric oven at something like ~40°C (~100°F) for a few hour. The details depend on the material and other details I'm totally unaware, so read the instructions and don't thrust my uninformed comment.