I needed a small box to put some desiccant inside, and need not found what I wanted. Designed with OpenSCAD so can be customized (STL render quite long, but works). For information, orange silicate really helps to find moisture, this box can lower the mixture in a bag with 3 spools from 48 %to 17% RH in less than 30 minutesUpdate : I would advise to do a bigger box than this one to increase maintenance time ;-)