How to Create Multicolor 3D Prints from Any Image

You have an image. A logo, a character, a design. You want it as a multicolor 3D print. Flat on a plate, multiple filament colors, each color in the right place.

The traditional way to do this is painful. You'd open the image in Inkscape, manually trace each color region, export separate SVGs, convert each to an STL, import them into your slicer one at a time, align them on the build plate, and assign filaments to each body. For a design with six colors, that's hours of tedious work before you even start printing.

MosaicFlow does the entire thing automatically. Upload an image, the AI separates the colors, you tweak the palette, and download a 3MF file that opens in your slicer with every color already assigned. The whole process takes about two minutes.

Why 3MF Changes Everything

The key is the file format. A regular STL file is just geometry. It has no concept of color. If you want multiple colors, you need multiple STL files and you have to manually assign each one to a filament in your slicer.

A 3MF file carries color information inside it. When you open a MosaicFlow 3MF in Bambu Studio or PrusaSlicer, each color region is already a separate object with its own material assignment. You just map each material to an AMS slot or extruder, and you're ready to slice.

No painting. No splitting. No alignment headaches.

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Step-by-Step: Image to Multicolor Print

Here's the complete workflow from image file to printed object.

Step 1: Choose Your Image

The best source images have distinct, flat color regions. Think logos, cartoon characters, pixel art, team emblems, stylized illustrations. Images where you can clearly see "this area is red, this area is blue, this area is white."

What works well:

• Logos and emblems with solid color fills
• Cartoon and comic-style illustrations
• Pixel art and retro game sprites
• National flags and sports team graphics
• Simplified nature illustrations (flat color style)

What doesn't work as well:

• Photographs with smooth gradients (the AI has to quantize thousands of colors down to a handful, which means arbitrary color boundaries)
• Watercolor or soft-edge artwork
• Images where adjacent colors are very similar

Step 2: Upload to MosaicFlow

Head to MosaicFlow and upload your PNG or JPG. The AI analyzes the image, identifies distinct color regions, and groups them. This costs one credit.

You'll see a preview of the separated colors as a bubble palette, where each bubble represents a detected color group. The size of each bubble roughly indicates how much of the image that color covers.

Step 3: Adjust the Color Count

MosaicFlow auto-detects and suggests an optimal color count (between 4 and 16). You can adjust this with the slider.

This is where your hardware matters. Count how many filaments your printer can handle in a single print:

Set your MosaicFlow color count to match your available slots. If you have a single Bambu AMS with 4 slots, keep it to 4 colors. If you've got dual AMS units giving you 8 slots, you can go higher.

Step 4: Merge and Exclude Colors

Fine-tune your palette using the bubble controls:

Merge colors: If the AI detected two similar shades of blue as separate colors, merge them into one. This frees up a filament slot for a more distinct color. Drag one bubble onto another to combine them.

Exclude colors: Remove colors you don't want printed. The most common use is excluding the background color. If your logo has a white background that shouldn't be part of the print, exclude it.

Step 5: Use the Despeckle Slider

The despeckle slider removes tiny color islands that are too small to print cleanly. Small specks of color surrounded by a different color are common in compressed images or photographs.

Crank it up if you see lots of tiny dots scattered through the preview. These would print as isolated blobs that look messy and might not adhere well to the surrounding material.

Step 6: Switch to the 3D Tab

Click the 3D tab to see a preview of your model. Here you configure the physical dimensions:

Model size: Set the width or height of the final print (50-500mm). The aspect ratio matches your original image.

Base thickness: The flat base under all the colors (default 2.0mm). This gives the print structural integrity. You can set it from 0.4mm to 10mm.

Per-color layer thickness: Each color layer sits on top of the base. The default is fine for most prints, but you can adjust individual layer thicknesses (0.4-10mm each) if you want some colors to stand proud of others.

The 3D preview lets you rotate and zoom the model before downloading. This preview is free.

Step 7: Download the 3MF

Click download to get your files. The download costs one credit.

MosaicFlow gives you a ZIP containing:

• 3MF file (checked by default): The multicolor model with all color assignments baked in. This is what you want for multi-material printing.
• Individual STL files (optional): One STL per color, for manual workflows or single-extruder printers.
• OBJ with vertex colors (optional): For rendering or other 3D applications.
• GLB preview: Always included for reference.

For multicolor printing, the 3MF is what matters. Leave it checked (it's on by default) and download.

Step 8: Import into Your Slicer

Open the 3MF in your slicer. Here's what happens in each:

Bambu Studio: The model imports with each color as a separate object. Go to the filament settings panel and assign each color to the correct AMS slot. Bambu Studio shows you a color preview so you can verify the mapping looks right before slicing.

PrusaSlicer: Similar experience. Each color body appears as a separate part. Assign filaments in the right panel. If you're using an MMU2/MMU3, each part maps to a filament position.

Cura: Cura supports 3MF with multiple objects. Assign each to an extruder. The workflow is slightly less visual than Bambu Studio, but the color assignments are still preserved from the file.

Step 9: Slice and Print

Slice with your normal settings. A few things to keep in mind:

Purge/transition tower: Multi-material prints need a purge tower (or purge into infill) to clean the nozzle between color changes. This uses extra filament. The more colors and the more frequent the color changes, the larger the purge waste.

Print time: Multicolor prints take longer than single-color prints due to filament changes. A 4-color design might take 50-100% longer than the same geometry in one color. Most of the extra time is spent on purging and swapping.

Bed adhesion: Flat multicolor prints (like the ones MosaicFlow produces) have great bed adhesion since they're essentially flat plates. Use your normal first-layer settings.

Which Slicer for Which Printer

All of these slicers handle 3MF files with embedded color data. See our slicer comparison for a deeper look at the differences.

Tips for Better Multicolor Prints

Match filament colors to your design. Before you finalize the palette in MosaicFlow, look at the actual filaments you have loaded. If your design has a bright red but you only have maroon, the result won't match your expectations. Adjust the MosaicFlow palette to work with the colors you actually own.

Use a raft or brim. Multicolor flat prints can warp at the edges because color transitions create slight stress. A brim helps keep things flat.

Print a test at small scale first. Scale the model down to 50% and do a quick test print. You'll catch color mapping errors, adhesion issues, and filament compatibility problems before committing to a full-size print that takes hours.

Simple designs print faster. A design with large color regions (few transitions per layer) prints much faster than one with lots of color interleaving. If print speed matters, favor designs with big, bold color blocks over intricate color mixing.

PLA works best for multicolor. PLA has the least stringing during filament swaps and the most consistent purge behavior. PETG and TPU are possible but significantly more finicky with multi-material setups.

For more on filament selection, check our filament guide.

What About Single-Extruder Printers?

You don't need a multi-material setup. You have two options:

Manual filament swap: Slice the 3MF normally but tell the slicer to pause at each color change. When it pauses, unload the current filament, load the next color, and resume. This works on any printer but requires you to babysit the print. Each layer gets one color at a time.

Print individual layers separately: Download the individual STL files (one per color) from MosaicFlow instead of the 3MF. Print each color as a separate flat piece, then glue them together. This is essentially the same concept as a multicolor wood inlay but with 3D printing filament instead of wood.

More 3D Printing Resources

If you're newer to 3D printing, our beginner's guide covers the fundamentals. For turning photos into 3D relief models (a different kind of image-to-print workflow), see our lithophane guide.

Go Print Something Colorful

Find an image with bold, distinct colors. A logo, a game character, a flag. Upload it to MosaicFlow, dial in your palette to match your available filaments, and download the 3MF. Open it in your slicer, map the colors, and hit print.

The first time you peel a multicolor print off the bed and see all those filament colors forming a clean image, you'll wonder why you ever considered doing it manually.

Happy making.