High Impact Polystyrene Filament is a 3D Printing Filament its similar to ABS filament. HIPS is strong and as stiff as ABS. HIPS is soluble in Limonene, which is not possible for ABS.Being Soluble with limonene make HIPS Filament ideal for printing 3d models that require support material. Best used with dual extruder 3d printer. You can print ABS or PLA with HIPS being the support material. When your print is complete give your print a limonene bath and wash the support material dissolve. No hassle and no need to removing support material with tools. HIPS is an easy way to remove support material.