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3mm Filament Diameter, 75D TPU Nylon Alternative Material. Print your 3D model in snow with the NinjaTek Armadillo 3mm 75D TPU Nylon Alternative Filament.With a shore hardness of 75D this thermoplastic polyurethane (TPU) nylon alternative filament has 84% better abrasion resistance than PLA and 60% better abrasion resistance than ABS. It is also resistant to many chemicals such as naphtha ASTM oils #1-3 petroleum and freon. It can be for bridging without having to worry about warping. Unlike ABS this filament does not require a heated print bed.