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@3dprinting These two advantages mean that firstly, you can smooth (and weld) HIPS without having to use acetone (limonene is _much_ nicer to work with), but also that you don't have to worry about dry storage _at all_.

HIPS sees relatively low use in FDM printing - it's mainly used as a soluble support for ABS - but in other places, it is _very_ widely used. For example, if you bought a plastic miniature recently, it was _almost certainly_ made of HIPS.