From Logo to Multicolour 3D Print: Getting a Clean 3MF

Printing a logo in its real colours is one of those jobs that used to mean an evening in Fusion 360 tracing curves. Today you can drop a PNG into a browser and get a 3MF where every colour is already a separate part. But the result still depends heavily on what you feed in and a few decisions along the way.

Start with the right image

The converter reads pixels, finds the main colours and turns each one into a shape. It does that well when the image cooperates:

• Flat colours, clean edges. Logos, icons, badges and lettering. A PNG with a transparent background is ideal.
• High resolution. At least 1,000 px across. Small images give stair-stepped edges once they're scaled to 80 or 100 mm.
• No gradients, shadows or glows. These get reduced to the number of colours you choose, so they come out as visible bands.
• Photos don't work. They turn into a posterised mess. For a photo, a lithophane is the right tool.

If your logo exists as a vector file, export it to PNG at a large size first. That gives the cleanest result.

Choose and clean up the colours

After loading, you pick the maximum number of colours (2 to 10, four by default). Think about your printer here: with a 4-slot AMS, more than four colours means manual swaps.

Three tools fix most problems:

• Click a colour to remove or restore it. A solid background is detected and removed automatically. Click it again if you actually want it.
• Merge into. Anti-aliasing often creates a near-duplicate colour along edges, like a dark grey next to black. Merge it into its neighbour instead of printing it as its own part.
• Only remove the outer background. When the background colour also appears inside the logo, such as white inside a letter, this keeps the inner areas and removes only the outside.

Size and detail: what the nozzle can draw

A 0.4 mm nozzle can't reproduce a line thinner than about 0.8 mm, and lines under 1.2 mm print weak and ragged. So the real question is how thin the thinnest part of your logo becomes at the size you print it.

The logo width defaults to 80 mm. If the logo has small text or thin outlines, try 100–120 mm, or use the clean-up settings: remove thin strokes deletes lines below a pixel width, and remove specks deletes tiny islands that would print as blobs. Path simplification and curve smoothing keep the outline from looking pixelated.

Heights and base plate

Each colour is extruded to a thickness, 2 mm by default. You can set all of them at once and adjust each one in the list. The Step: +mm per color setting adds a little height per colour so they sit at different levels: a subtle relief that also matters for single-nozzle printing (see below).

A base plate holds loose parts together: none, a rectangle, or one that follows the outline, with its own thickness, margin and colour. For a fridge magnet or a badge, an outline plate in white or black usually looks best.

Printing with an AMS or MMU

Download the 3MF. Bambu Studio, OrcaSlicer, PrusaSlicer and Cura open it as one object made of several parts, each with its colour already set. You only need to map each part to a filament slot.

To save filament, turn on Color only on the top layers. The body prints in one colour and only the last few layers carry the logo colours. Since colour swaps only happen in those layers, the purge waste drops dramatically on large logos.

Printing with a single nozzle

A single nozzle prints one colour per layer, so the colours must be stacked by height. Use Step so each colour sits higher than the previous one, for example 1.2, 1.8 and 2.4 mm. Then download the STL and insert a colour change at each step height in your slicer.

Seen from the front, every area shows its own colour. Seen from the side, the lower layers are all the first colour, which is fine for badges, magnets and signs that are viewed head-on. Our guide to two-colour prints with one nozzle explains how to set colour changes in each slicer.

Before you download

• Thinnest line at least 1.2 mm at the final width
• No near-duplicate edge colours left over
• Base plate if any part is floating on its own
• Colours mapped to slots, or step heights noted for manual changes

Your first two logo downloads are free once you sign in, and the preview shows you exactly what you'll get before you use one.