Can anyone tell me what 3D printed material is most like HDPE?

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Probaby PET or PETG, which properties do you need?

High-density Polyethylene (HDPE) is a thermoplastic made from petroleum. It is commonly used to produce plastic bottles, milk jugs, and plastic bags. HDPE has little branching, which gives it its density and strength. HDPE is a #2 plastic recyclable material and is easily recyclable.

HDPE was tried early on with reprap 3D printing and was found to have very bad warping properties. Please be more specific about what properties you are looking for: elasticity, yield strength, thermal stability, density, hardness, etc…