TPU is a flexible rubber like compound that is easier to print with than TPE as it is more rigid.
TPU vs TPE. TPE (ThermoPlastic Elastomer) is most commonly know through the NinjaFlex brand. It is essentially a plastic with rubber like properties. Typically prints are very elastic (you can stretch them up to twice their size and tey bounce back into shape). It is really soft, generally with a shore hardness of 85A. This makes it difficult to print with (YOU MUST HAVE A ZERO GAP EXTRDER FEEDER SYSTEM)
TPU (ThermoPlastic Polyurethane) is similar to TPE, however slightly more rigid (shore 94A), making it easier to print with; and has a higher abrasion resistance, and a natural high resistance to oils and solvents.
TPE is usually around 1.2-3%. TPU has lower shrinkage (approx 0.8-1.8%)
Both TPU and TPE are generally regarded as non-toxic
Flex generally likes a glass plate that is heated to 30-35°C, and extrudes between 210-240°C. You MUST slow extrusion speed down to 15-30mm/sec
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