Updated October 22, 2026
The trick: change color at a certain height
You don't need a multi-color printer for your keychain or sign to come out in two colors. The parts from our converters have a flat base with the relief on top (the QR, the letters, the signature). If the printer makes the base in one color, stops, you swap the filament and it continues with the relief, the part comes out in two colors.
Below each converter's 3D preview we tell you the exact height for the change: for example, "Color change at 3 mm (layer 16 at 0.2 mm)".
How to add the change in your slicer
Menu names vary a little between versions, but in all of them it's done in the layer preview:
- PrusaSlicer: in the preview, move the layer slider up to the first layer of the relief and click the "+" next to it: it adds a color change.
- Bambu Studio and OrcaSlicer: in the preview, on the layer slider, right-click the layer where the relief starts and choose to add a pause or a filament change.
- Cura: under Extensions → Post Processing → Modify G-Code, add the "Pause at height" script and enter the height we gave you.
During the print
When the printer stops, pull out the base filament, load the second color and push a little until it comes out clean from the nozzle (with no trace of the previous color). Then resume from the printer's screen.
If your printer doesn't recognize the automatic color change, use the pause option: it works the same, you just do the swap by hand.
So it reads well
- A light base and a dark relief (or the other way around) with strong contrast: white with black, yellow with black, cream with navy blue.
- For QR codes, a light base and dark code is better: some phones can't read an inverted QR.
- A relief of 1 to 1.5 mm is enough for the color to show.
If you have a multi-color printer
With a multi-color system (such as AMS, MMU or similar), download the 2-color file from our converters: it's a 3MF that already contains the base and the relief as two parts of one object, in place. Open it in your slicer and assign a filament to each part. If your slicer doesn't open 3MF, the two separate STLs are right below the button.
Frequently asked questions
Does the join between the two colors show?
No: the relief prints on top of the base and bonds well. Just purge the nozzle properly when you swap so there are no streaks of the first color.
Can I do more than two colors?
Yes, with more pauses at different heights, but each color has to start on a different layer. For two colors on the same layer you need a multi-color printer.