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Paint tool: colour any model for multi-colour printing

Colour any model for a multi-colour printer: brush stripes, fill whole faces in one click, or paint a whole part at once - then export a 3MF that OrcaSlicer, Bambu Studio and PrusaSlicer open painted, each colour on its own filament. Everything happens in your browser.

1Open Paint

Select a body and click Paint (the brush) in the toolbar - or use this link, which starts a new project with a star to paint. The panel on the right has the tools, the colours and the mouse keys. Before you click, the area a click would paint is shown lightened with a white outline.

2Tools

• Brush - drag on the body to paint where the brush goes. Size sets its width (or the keys [ and ]). Only the side facing you is painted.
• Fill area - click a face: the smooth area around it is filled, up to sharp edges. Stop at edges sets how sharp an edge has to be to stop the fill (30° by default) - lower it to stop at gentler edges.
• Whole part - click once to paint a whole part: a letter on a plate is painted top and sides, up to where it meets the plate; a separate piece is painted completely.
• Eraser - removes paint. A right-click without dragging also erases what a left click would paint, and Shift-drag erases with the brush.

3Colours

Click the big square for any colour, or a swatch. On this body lists the colours already used on it, so you can pick one again exactly. Each colour becomes its own filament when you export.

4Smooth edges: finer triangles

Paint covers whole triangles of the mesh. On a simple shape with big triangles the edge of the paint looks jagged - click Finer triangles (×4) once or twice before you paint, and the brush follows your stroke closely. Clear paint removes all paint from the body. Every stroke is one undo step (Ctrl / Cmd + Z), and undo keeps Paint open.

5Print it in colour

• Click Export ▸ Multi-colour 3MF. OrcaSlicer, Bambu Studio and PrusaSlicer open it painted, each colour on its own filament - assign your filaments and slice.
• Paint stays with the body when you move, turn or resize it. Union keeps the colours of the bodies it joins, and cutting a painted body below the bed or in two keeps its paint.
• Tools that rebuild the mesh itself, such as Make solid or Reduce file size, remove the paint - do those first and paint last.

Questions

Also see: Image to 3D sticker, HueForge generator, Sculpt tool and all guides.