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maybe I'm missing something, but PLA is just 3d printer filament. There's only two plastics commonly used for extruder-style 3d printers, and they're ABS and PLA.

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This is a bit out of date. Nylon, PETG, TPE/TPU and polycarbonate are quite common for home 3D printing now as well as a number of hybrid materials.

Polypropylene is coming in too. PVA for water-soluble (mostly as support material).

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