Despite several great options already on the market, I've decided to model my very own Dropperbottle style Paintbottle holder. The Modular Paintbottle Holder can hold up to 3 standard Dropperbottles such as Army Painter, Vallejo or AK Interactive per unit and can be expanded indefinitely! (Or until your filament runs out) The holder was specifically designed for Army Painter Dropperbottles so you can read the color of their hexagonal label but it should work fine with other brands.