Written by Harry S.
Quick answer: Chameleon, dual-colour and tri-colour filaments change with viewing angle, lighting and print orientation, so curved, faceted and vase mode models show them best. OzFDM PLA Colour Change is a different effect: it reacts to heat and slowly returns to its original colour as it cools. All the PLA versions print at normal PLA settings.
Colour-shifting filament is one of the easiest ways to make a simple print look expensive, but the same roll can give a flat, dull result on the wrong model. The difference is almost always shape, orientation and light, not slicer magic. This guide explains the three effects sold under "colour changing" names, which models make the most of each one, the settings from our product pages, and how to photograph the result so it looks the way it does in your hand.
Three effects that get called "colour changing"
Before choosing a model, work out which effect you are buying. They behave differently on the printer and on the shelf.
| Effect | What makes the colour change | OzFDM filaments | Shows best on |
|---|---|---|---|
| Colour shift (chameleon) | Viewing angle and the direction of the light | PLA Chameleon, ASA Chameleon | Curves, sculptures, figurines, textured surfaces |
| Co-extruded dual and tri-colour | Which side of the strand faces outward, set by orientation and the toolpath | PLA Chameleon Dual Colour, Silk Fusion PLA, Tri-Colour Silk PLA | Vases, faceted and low-poly models, ornaments |
| Heat-reactive colour change | Temperature, such as a warm hand | PLA Colour Change | Toys, fidgets, keyrings, classroom demonstrations |
How the colour shift works
Surfaces that change colour as you move around them are showing a form of iridescence, also called goniochromism: the colour you see depends on the angle of view or the angle of the light. The pearlescent paint finishes used on cars produce the same kind of iridescent effect.
Our PLA Chameleon page describes prints that transform under different lighting and viewing angles, with a silky, shimmering surface. It also explains that each shade uses co-extruded colour blends, with two complementary tones running through a single strand. In practice that means two things are working at once: the shimmer changes with the light, and the tones change with the shape of the part. That is also why the product page warns that on-screen colours and hex values are indicative only.
How co-extruded dual and tri-colour filament works
Dual-colour and tri-colour filaments carry two or three colours side by side along the whole strand. When the nozzle lays down an outer wall, one side of that strand ends up facing outward. As the toolpath curves and turns corners, a different colour can end up on the surface.
Our Tri-Colour Silk PLA page puts it simply: unlike gradient filaments that shift over the length of the roll, the co-extruded structure gives colour variation across every layer, so each surface can reveal a different tone depending on orientation. The Silk Fusion PLA page adds that printing the same model twice at a different orientation can give a different balance of colours. This is different from rainbow filament, where the colour changes along the length of the roll and shows up as horizontal bands.
Because every colour is in one strand, these filaments use a single AMS slot and need no filament changes.
How OzFDM PLA Colour Change works
PLA Colour Change is heat-reactive. The product description says it shifts between two colours in response to temperature changes, and the original colour gradually reappears once the temperature returns to normal. It is not a UV-reactive filament and it is not a co-extruded dual-tone strand. Each variant name (Orange-Yellow, Purple-Rose, Grey-White and Brown-Green) lists the two colours it moves between.
The general name for this is thermochromism. Heat, ultraviolet light and some chemicals shorten the life of thermochromic dyes, and the product page rates PLA Colour Change as limited for UV resistance, so keep finished prints out of direct sun. The page does not state an exact switching temperature, so test a small print with your hand before you plan a project around it.
Model shapes that show the effect
The more a surface changes direction, the more colour you see. A flat, front-facing panel shows one tone at a time, whatever filament you use.
- Curved and organic forms. Vases, twisted spirals, busts, animals and figurines. The PLA Chameleon page notes the effect brings life to curved surfaces and textured designs.
- Faceted and low-poly shapes. Each face sits at a different angle to the light, and with co-extruded filament neighbouring faces often pick up different colours.
- Ribbed, fluted and textured surfaces. Fine vertical ribs catch light on one side and shade on the other. Our guide to fuzzy skin and texture effects shows how to add texture in the slicer.
- Things people handle. For PLA Colour Change, pick fidget toys, keyrings, hand-held puzzles and educational models. Thin sections warm faster than thick ones, so edges and thin walls change first.
Skip very small parts and models dominated by large flat faces. They hide the effect you paid for.
Orientation, vase mode and slicer settings
Rotate the part on the plate
With dual-colour and tri-colour filament, rotating a model on the build plate changes which colour lands on which face. If the colour of one side matters, such as the front of a figurine, print a small test at two or three rotations and keep the one you like. PLA Chameleon is also made with co-extruded colour blends, so the same test is worth doing with it.
Use vase mode for single-wall pieces
Vase mode is ideal for colour-shift filament because it prints one continuous outline. The Prusa Knowledge Base explains that spiral vase mode prints a single outline container while the height rises gradually, and switches to one perimeter, 0% infill, no top solid layers and no supports. With no layer change there is no seam to interrupt the colour, which makes it a good fit for vases, lamp shades and ornaments. Only one object can print in vase mode at a time.
Seam, layer height and speed
- On normal prints, put the seam on a sharp rear corner so it does not break up a smooth curve.
- Finer layers give a smoother, more reflective surface, which suits silk and chameleon finishes on display pieces.
- Only the outer wall is visible, so adding walls does not change the look. Add walls for strength, not colour.
- Stay inside the speed range on the product page. The silk-finish filaments list slower speeds than PLA Chameleon and PLA Colour Change.
Settings from our product pages
| Filament | Nozzle | Bed | Speed | Drying | HDT (0.455 MPa) |
|---|---|---|---|---|---|
| PLA Chameleon | 190–220°C | 25–60°C | 60–90 mm/s | 40–45°C for 4–6 h | 53°C |
| PLA Chameleon Dual Colour | 190–220°C | 25–60°C | 60–90 mm/s | 40–45°C for 4–6 h | 53°C |
| PLA Colour Change | 190–220°C | 25–60°C | 60–90 mm/s | 40–45°C for 4–6 h | 53°C |
| Silk Fusion PLA (dual-colour silk) | 200–230°C | 25–60°C | 40–60 mm/s | 40–45°C for 4–6 h | 53°C |
| Tri-Colour Silk PLA | 200–230°C | 25–60°C | 40–60 mm/s | 40–45°C for 4–6 h | 53°C |
| ASA Chameleon | 240–260°C (250°C recommended) | 100–120°C (110°C recommended) | 40–60 mm/s | 80°C for at least 5 h | 88°C |
Every product page also has a downloadable PDF data sheet with the full mechanical and thermal figures.
ASA Chameleon for outdoor pieces
All the PLA-based filaments above have a heat deflection temperature of 53°C, so they belong indoors and out of hot cars. If you want the colour shift on a letterbox number, garden ornament or car part, use ASA Chameleon. The product page lists UV resistance and weather stability as core features, and an HDT of 88°C.
It is a harder material to print. The page says an enclosed printer is essential for stable chamber temperatures and odour control, recommends drying at 80°C, and advises against using it in an AMS Lite, which is built for the open-frame A1 series. Our guide to ASA vs ABS for outdoor prints covers enclosures and warping in more detail.
Photographing colour-shift prints
A phone camera flattens colour shift unless you give it something to work with. These habits make the biggest difference:
- Use one directional light. A window or a desk lamp placed to one side at roughly 45 degrees shows the shift. Flash and overhead lights hit everything evenly and hide it.
- Soften hard light. Silk finishes blow out easily. Put baking paper or a white sheet between the lamp and the print.
- Keep the background plain. Mid grey or black lets the colours stand out and stops the camera chasing a busy scene.
- Lock focus and exposure. Most phone cameras let you lock both, often by tapping and holding on the subject, so the colour does not jump as you move.
- Shoot a set, or a short video. Take the same print from two or three angles, or rotate it slowly on a lazy Susan for a few seconds of video.
- For PLA Colour Change, shoot before and after. Photograph the print cool, then hold it in your hands and shoot again. Do not use hot water: PLA softens near its 53°C HDT.
Shop the materials in this guide
- 1.75 mm PLA Chameleon - 1 KG: shimmering colour shift at normal PLA settings.
- 1.75 mm PLA Chameleon Dual Colour Filament - 1 KG: two colours in one strand for orientation-driven effects.
- 1.75 mm PLA Colour Change Filament - 1 KG: heat-reactive colour change for toys and fidgets.
- 1.75 mm Silk Fusion PLA Filament - 1 KG: ten dual-colour silk combinations.
- 1.75 mm Tri-Colour PLA Silk Filament - 1 KG: three co-extruded colours with a high-gloss finish.
- 1.75 mm ASA Chameleon Filament - 1 KG: colour shift for outdoor and heat-exposed parts.
Frequently asked questions
Is chameleon filament harder to print than normal PLA?
No. PLA Chameleon, PLA Chameleon Dual Colour and PLA Colour Change all list 190–220°C nozzle and 25–60°C bed temperatures, which are ordinary PLA settings. The silk versions list slightly hotter nozzle temperatures and slower speeds. ASA Chameleon is the exception and needs an enclosed printer.
Does PLA Colour Change react to sunlight?
It reacts to heat, not UV light. Sunlight can still warm a print enough to change it, and UV shortens the life of thermochromic dyes, so display colour change prints away from windows.
Can I run these filaments through a Bambu Lab AMS?
The PLA Chameleon page says it works with the AMS and AMS Lite on standard sized spools, and the Tri-Colour Silk PLA page notes you get the full effect from one AMS slot. ASA Chameleon is not recommended for the AMS Lite. Our guide to using OzFDM filament in the Bambu AMS covers spools and presets.
Why doesn't my print look like the product photo?
Lighting, viewing angle, model shape and print orientation all change the result, and our product pages note that on-screen colours are a guide only. Try a curved or faceted model, rotate it on the plate, and look at it under a single side light before judging the colour.
