Turn your old or existing 3d printers into filament dryers with this simple accessory. This filament dryer fits most 1kg spools of filament and is simply placed over your heated bed. Simply put your spool of filament on your heated bed, cover it with the filament dryer, and turn on your heated bed to the desired temp. The 3 vents at the top let the warm humid air escape making it dry faster and the dryer can easily printed on a 230mm square build surface. This is a perfect hack to dry your filament without needing to spend $40 - $100.