In the commercial world, high impact polystyrene (HIPS) – a copolymer that combines the hardness of polystyrene and the elasticity of rubber – is commonly found in protective packaging and containers, like CD cases. In the world of 3D printing, HIPS typically plays a different role. 3D printers can’t print onto thin air. Overhangs require some underlying structure, and this is where HIPS really shines. When paired with ABS in a dual extrusion printer, HIPS is an excellent support material. Sharing many characteristics with ABS, HIPS 3D printing filament is a good all rounder for parts that need to stand up to wear and tear or for projects that require a finishing-friendly material to achieve the end look.