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Dutch firm Hembased is launching a cold compostable filament. Cold compostable means that the material should return completely to nature in a regular compost bin that you may already have in your home. This contrasts with industrially compostable materials, which are meant to break down in heated industrial composting sites.
Cold compostable materials must degrade within a year in temperatures between 20-30°C. They must also not leave anything harmful behind and theoretically should compost in the soil. ColorFabb´s allPHA has led the way in compostable, actually sustainable biomaterials for 3D printing. Companies such as Regen filaments have followed suit. Usually PHA is used, which can be made from agricultural waste or byproducts. PHA turns into water, biomass, and Co2. PHA prints well