Monthly Archives: November 2014

HIPS

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).

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Smoothing PLA

We’ve written before about smoothing ABS prints using acetone vapor. This works very well, blending the printing layers together for a smoother finish and increased strength. Acetone is not particularly toxic and easy to obtain (in the Netherlands, any chemist stocks it).

For PLA, however, acetone smoothing does not work. This is a pity, since PLA is much easier to work with than ABS. We found some solutions for smoothing PLA, but most involve rather dangerous-sounding chemicals such as Tetrahydrofuran and Dichloromethane. The one exception we found is Ethyl Acetate which seems to give good results and is (relatively) safe. This was something we wanted to try for ourselves.

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