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Paint any colour onto a 3D model, then export it as a multi-material 3MF file that uses cyan, magenta, and yellow filament dithering to reproduce your painted colours on an FDM 3D printer.

🎬 Video Tutorial

📐 Step 1 — Load & Orient

1. Upload an STL file by dragging it onto the tool or clicking the upload area.
2. If needed, use the Orient button to click a face that should sit on the build plate.

🎨 Step 2 — Paint

1. Choose a colour from the colour picker on the left.
2. Use Brush for freehand painting (visible faces only), Sphere for 3D-radius painting, or Fill for flood-filling regions.
3. Adjust brush radius with the slider. Use Ctrl+Z / Ctrl+Y to undo/redo.
4. Set the Base Colour for any unpainted areas.

⚙️ Step 3 — Process & Export

1. Choose a Filament Mode — CMY (3 filaments) for most use cases, or add white/black for better highlights and shadows.
2. Click Process to generate the dithered 3MF file.
3. Click the Download button that appears in the viewport.

🖨️ Step 4 — Slicer Settings

Import the .3mf file into your slicer (e.g. Bambu Studio, OrcaSlicer). Use these settings for best results:

Assign each filament slot in your slicer to match the export mode (Cyan, Magenta, Yellow, and optionally White/Black).

Get Started 🚀

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Terms of Use

About Primed3D

Primed3D is a free, open-source tool created and shared with the 3D printing community by Josh at 3D Revolution. It is provided as-is, free of charge, for personal and commercial use.

Your Privacy & Data

Everything happens in your browser. Primed3D runs entirely client-side — your STL files, painted models, and exported 3MF files are never uploaded to any server. No data leaves your device at any point. There are no accounts, no tracking, and no analytics. Your files stay yours.

Open Source

Primed3D is released as an open-source project. You are free to use, modify, and share it. If you redistribute or build upon it, please credit the original project and its creator.

No Warranty

This tool is provided without warranty of any kind, express or implied. The creator is not liable for any damages or issues arising from its use, including but not limited to failed prints, material waste, or printer issues. Use at your own discretion.

3D Printing Results

Print quality depends on many factors outside the control of this tool, including your printer, filament, slicer settings, and model geometry. The colour dithering is an approximation — results will vary between setups. The recommended slicer settings are a starting point, not a guarantee.

Third-Party Services

Primed3D itself does not connect to any external services. Optional links to YouTube and Buy Me a Coffee are provided for convenience and open in new tabs — they are governed by their own terms and privacy policies.