High-Impact PolyStyrene (HIPS) is one of the less known 3d-printing materials. Most people that have heard of it know it as a dissolvable support material used in combination with ABS, because it dissolves in d-limonene (and ABS does not). It is not frequently used as a printing material in itself.
The guys from Form Futura want to change that because they believe that HIPS could be a very nice primary printing material. They are bringing out a line of HIPS filaments in 1.75mm and 2.85 mm diameters, at the moment only in white but black, red and gray are planned. They asked us to test a spool of their 2.85mm white HIPS and see how it compares to ABS and PLA. We wanted to look at a number of characteristics: extruder temperature, print bed, warping, quality and ‘smoothability’ (i.e., can HIPS be vapor-smoothed like ABS with Acetone).