HIPS (High Impact Polystyrene) is a relatively new material for FFF/FDM
printers. Polystyrene filament has many similar characteristics to ABS
filament with regards to impact strength and hardness.
It often used as support material but even on its own it prints very nicely.
The Polystyrene plastic filament can be dissolved
completely in Limonene. If you have a dual extruder, you can print with ABS and
create structures impossible to make without support (think large overhang, ball
socket joints, and gear mechanisms). Soak the finished print in Limonene which
dissolves away the HIPS leaving the final ABS part.
3D-Prima HIPS 3D filament is suitable for a variety of 3D printer, Makerbot,
Leapfrog, Reprap, Ultimaker, Mendel, Prusa, Huxley, Wanhao, Flashforge and many
other FDM printers.