High-impact polystyrene (HIPS) is a great lightweight plastic that has excellent dimensional stability. It's a common plastic that's used in the manufacturing of toys and product casings. It's very much like ABS and has a similar range of available colors.

The average temperature for 3D extrusion should be around 220 to 230 degrees Celsius. It has low warp characteristics and prints well on acrylic, glass, and Kapton tape. A heated bed temperature of up to 110 degrees Celsius is helpful.

Its special characteristic is that it's dissolvable in limonene (citrus cleaner). This makes it a good material for printing dissolvable support material with a dual extruder.

HIPS should be used in a well-ventilated area. HIPS products are capable of releasing small amounts of fumes at high temperatures. While these fumes are generally considered tolerable, care should be taken to minimize exposure.