The Polymaker PolyBox™ Edition II filament drybox prevents your filament from getting damp. This box allows you to store spools in an optimal environment with six holes in the transparent hood allowing you to guide the filament through. This drybox is equipped with a clear thermo-hygrometer displaying the temperature and humidity. The drybox ensures humidity and moisture regulation through the use of moisture-absorbing desiccant bags. The storage boxes have space for two 1 kg spools or one 3kg roll. 3kg Polymaker brand spools are compatible with this drybox, but our 2.3kg and 3kg 123-3D version will not fit.