Color Changing Filament – Thermochromic 3D Printer Material Review


Another interesting desktop 3D printer material to try is the color changing filament. Manufacturers often surprise us with something new and unusual, like adding sparkles or multicolored segments on the spool. This time they got our attention by introducing a thermochromic filament, which changes its color depending on the temperature. Let’s test how the color changing PLA works, and where it can be used. We will also touch upon “glow in the dark” and “rainbow” filaments.

Color Changing Filament - Thermochromic 3D Printer Material Review

Color Changing Filament – Thermochromic Material

Thermochromic Material – Color Changing Under Temperature Fluctuation

Outside of the hobbyist desktop 3D printing world, there are quite a few practical uses for such materials. The color changing filament property is valuable in baby bottles to indicate when the milk is cool enough to drink, for example. A specific color tone can also indicate when a kettle is approaching the boiling point. Jewelry pieces, such as “mood rings”, contain the special color changing liquid crystals.
In the “3D printing at home” world, we have come across the color-changing PLA. We suspect that the manufacturers chose PLA because it is the most popular, beginner-friendly, and easier to deal with. If there is a demand in future for other types of color changing materials, we could see it in PETG or ABS.

Amolen Color Changing PLA – Desktop 3D Printing Filament

We first learned about the Amolen color changing PLA when we saw the awesome makes of Jukka Seppänen (Kijaidesign) on Instagram. His nine-tailed demon fox has been displayed in a 20+ hour Octolapse time-lapse when color was changing in the process. As he used it to portray the fire this “bright yellow – molten rock – cooled rock” transition worked especially well. His models made us want to buy this filament to try it out.

Color Changing Filament - Amolen Tri Color PLA Shades

Amolen tri-color PLA shades. An object in the middle. Dog The Gardener.

Black to Brown to Yellow Amolen Color Changing PLA

Officially it is called “Black to Brown to Yellow Tri-color Changing PLA”. To be precise, we would call it “Cooled Rock – Molten Rock – Fire Bright Yellow. The cooled rock would be a more suitable description for its initial color on the spool. When completely cooled down, it has a dark greyish color, similar to the stone. After sitting in the fridge, a bit of a greenish tone came through. The orange-brownish color kicks in at 30°C – 45°C. We have to say that this is a very nice color resembling the molten lava. Sad that this color only stays for the shortest amount of time, and transitions further to bright yellow at the temperature above 45°C. Bright yellow also looks nice, only it is not as camera-friendly, unfortunately. When capturing a model in bright yellow, it seemed as if the picture was overexposed.


Amolen Color Changing PLA Details:

Weight – 1 kg
Length – 340 m
Density – 1.2-1.25 kg/m3
3D Printing Temperature – 190°C – 220 °C
Recommended Heating Bed – 0°C – 50°C
Printing Speed – 50-90mm/s
Color Transition 30°C – 45°C



Color Changing Filament – Unlikely Practical Uses

While testing the Amolen color changing PLA, we’ve discovered a few unlikely practical uses for it. Here are some examples of where its temperature measuring function can be applied.

3D Printed Coaster - Color Changing PLA - Cup of Tea and Candle in a Glass

3D Printed Coaster – Color Changing PLA – Cup of Tea and Candle in a Glass

1) Teacup coasters will indicate how hot is your drink. Check our blog about 3D printed coasters.
2) Heated electric devices. Our Valentine Turkey set stands on a TV Free View box and indicates if it is powered or not.
3) 3-in-1 test print. Sometimes designers are not sure in which color it is best to showcase their newly designed objects. So instead of 3D printing multiple prints in different filaments, it is possible to 3D print in one color changing PLA to compare at least in three color tones.

Color Changing Filament - Amolen Dark Grey to Orange Red to Lime Yellow PLA

Amolen Dark Grey to Orange Red to Lime Yellow PLA. Vica Illusion.

4) Planter pot. If your pot for the flowers is 3D printed is color changing PLA, it will alert you when it overheats, and the flowers may find themselves in an uncomfortable environment. This filament served us well when our “Dog the Gardener” got overheated on the windowsill, and we had to rescue our little plants from the complete drought.

Color Changing Filament - Before After Prolonged Sunlight Exposure

Before-after a prolonged sunlight exposure. The Dog’s color changing effect faded.

NB! The manufacturer stated that in the exposure to the direct light this color changing feature may fade over time.
We had our plants saved, but the color transitioning property faded away over time as per the manufacturer’s guideline. Well, it was worth the experiment.

3D Printing Ideas Using Color Changing Filaments

Volcanos, molten rocks – these are the first ideas that come to mind when we see this filament’s color transition. High-temperature bright yellow could be a fire.
Illusions – If you aim for a double surprise for your family and friends, this would be a good filament choice for 3D printed illusions.
Hearts – A dark stone heart changed to red when heated in the hands – magic.
Chameleons – It would be great so see 3D printed chameleons changing color in any two-color or tri-color transition.

Rainbow Multicolor 3D Printing Filament

As promised, a few notes about “Rainbow Multicolor PLA”. Don’t get confused about these two. Rainbow multicolor does not change color with light exposure or temperature differences. Instead, it has a different color every 5 to 15 meters, fused together into one consistent thread. Ideally, when 3D printed, your object should have a very smooth transition of colors. The hardest part is to properly calculate the model size before 3D printing. This material needs a new and different approach, and we will cover this type of filament in a new blog with unique footage, so stay tuned.


Glow in The Dark – Color Changing Filament

Phosphorescent material absorbs the light (a better effect with the UV light) and glows once in the dark. There is the same issue, though, like with color-changing PLA, when this property fades over time if exposed to the direct sunlight for too long. A full blog with unique footage coming soon.
We received a few samples of Bright Green and Bright Blue phosphorescent material. Spider cobwebs designs are ideal for these samples. Other ideas for the small sample prints would be Halloween spider nets and spiders, butterflies, etc. With a bigger filament amount, it could be Minecraft Creeper, Slime the Ghost, Hulk, zombies, etc.


Transparent Filament

A transparent filament cannot be referred to as the color changing filament, strictly speaking. However, it is tempting to mention it here as its color transition happens while it is used on a desktop 3D printer. It depends on how it is 3D printed. For example, if 3D printing in a vase mode, it stays transparent in any color shade. But when an object has more perimeter shells (walls) and infill, then it does not come out transparent.

Transparent Filament - Applied with 3D Pen

Transparent Filament – Applied with 3D Pen


Source and Files

Dog the Gardener & Valentine Bird by Max Funkner.
Ambiguous Cylinder by Devin Montes.
Vica Illusion sculpture by chylld.
Flexi Heart by Datheus.



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