The Polymaker PolyBox™ Edition II filament drybox prevents damp filament. 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 1 3kg roll. 3kg polymaker brand spools are compatible with this drybox but, our 2.3kg and 3kg 123-3D version will not fit.