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250-g small spool, simply store in a desk drawer, stacked space. High strength but flexible. TPU (thermoplastic polyurethane) is essentially polyurethane, it belongs to the TPE (thermoplastic elastomer) class of thermoplastics. Oil, grease and abrasion resistance. Widely used in many applications. Power tools, sports goods, medical devices, drive belts, etc. Suitable for common 3D printers on the market. Thanks to its 1.75 mm size, SainSmart TPU (thermoplastic polyurethane) works with most 3D printers.