Category Archives: filament

filaments for 3d printing

Refil – 3D printing with recycled plastics

There’s a new filament brand in town: Refil. Their filaments are made from recycled plastics. At the moment they offer black ABS (from recycled car dashboards) and PET (from recycled drinks bottles), with more colors and materials to follow soon. When we attended a presentation by one of the founders, he gave us samples of both filament types and we were eager to see if this stuff was any good.

One of the main problems in any recycling project is that the source material is usually full of contaminants, additives and impurities. Refil appears to have solved this problem, using a combination of pickiness (only using RoHS/REACH-compliant source materials) and technology (working with industry partners from the recycling and processing areas). The result are filaments that look very good “on the roll”, indistinguishable from virgin material. Because the filament is made on very high-quality, industrial extruders, filament roundness and diameter is as constant as that of any other commercially produced filament. In keeping with the recycling philosophy, the spools are made of recycled cardboard, which is a nice touch.


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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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Testing Thermochrome EcoPLA filament

The guys from Formfutura were kind enough to give us some special filaments to test not so long ago. We have started our test with the Thermochrome filament.

Thermochrome filament is a normal PLA filament with an additive that makes it change color depending on the temperature. Under 29ºC it looks black and above that it starts getting white.

thermochrome roll
This is how the thermochrome roll looks at the room temperature (about 20ºC)

We tried our usual calibration Lego Brick in our Prusa i3 printer, which we have very much under control.

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Printing wood

We bought some wooden filament and it’s finally here. So today is wood printing day!
We’re still figuring out what are the correct settings for this filament but it looks so sexy in our printer that we wanted to share a picture of it.