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PrimaSELECT PLA is a very nice 3D Print material, it´s non-toxic and has a no unpleasant smell when you print with it. Because of its thermal characteristics it's easy to get great prints. Filament from PrimaFilaments comes on a transparent spool which makes it easy to see how much filament there are left on the spool. Polylactic acid (PLA) is a bio-degradable polymer that is produced from lactic acid, which can be fermented from crops such as corn.