Printing in Multiple Colours with FDM – Everything You Need to Know
3D printing is no longer limited to single-shade prototypes or basic models. With the rise of multi-colour FDM (Fused Deposition Modelling) techniques, creators and small businesses are adding personality and realism to their prints. From colourful prototypes to functional objects with design elements, the possibilities are endless. But how exactly can you achieve this with a regular FDM 3D printer?
This guide explores all the methods—from manual filament swaps to dual extruders—and provides real-world examples to get you started with vibrant, multi-colour 3D printing.
1. Why Go Multi-Colour?
Multi-colour printing improves both the aesthetic value and functional clarity of a 3D model. Whether it’s:
- A product prototype with branding colours
- A multi-colored keychain
- An educational model with distinct parts
Colour enhances both visual appeal and user understanding.
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2. Common Methods to Achieve Multi-Colour FDM Prints
A. Manual Filament Change (Single Extruder)
This is the easiest and most affordable method.
How it works:
- Pause the print at a certain layer height
- Swap out the current filament for a new colour
- Resume printing
Pros: Low cost, works with basic printers
Cons: Time-consuming, requires close monitoring
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B. Dual Extruder Printers
Some printers come with two extruders, allowing you to print two different filaments/colours in a single run.
Pros: Seamless blending of colours, no manual intervention
Cons: More expensive machines, setup can be tricky
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C. Multi-Material Units (Like Prusa MMU)
Add-ons like the Prusa Multi-Material Unit (MMU) let you print with multiple filaments using a single hotend. These units automatically feed different filaments layer-by-layer.
Pros: More flexibility in colour switching
Cons: Steep learning curve and more calibration
3. Design Tips for Multi-Colour Printing
To get the best results, your model should be designed with colour zones in mind.
- Use CAD software like Fusion 360 or TinkerCAD
- Design each colour section as a separate mesh or STL
- Align and group them correctly before slicing
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4. Slicing Settings and Software
Slicers like PrusaSlicer, Cura, and IdeaMaker support multi-colour settings.
Key features to enable:
- Colour Change Scripts
- Tool Change Retractions
- Sequential Printing for different zones
Pro Tip: For Cura users, use the “Pause at Height” plugin to automate filament change for single-extruder printers.
5. Post-Processing to Enhance Colours
Even if minor bleeding or colour overlap happens, post-processing can clean it up:
- Use sharp blades or hobby knives to trim excess
- Light sanding between colour transitions
- Acrylic paints for minor touch-ups
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Cost Breakdown
| Method | Equipment Cost | Complexity | Best For |
|---|---|---|---|
| Manual Swap | ₹0 (existing) | Easy | Beginners |
| Dual Extruder | ₹40,000+ | Moderate | Professionals, Small Biz |
| Prusa MMU or Similar | ₹20,000+ | Advanced | Hobbyists, Designers |
Example Scenarios
- A school project: Use two-colour FDM print with manual swaps to make a globe with ocean and land separation.
- A startup prototype: A dual-extruder printer is used to print a product casing with embedded branding in company colours.
- A personalised gift: Create a nameplate or keychain with colourful layers using Cura’s pause-at-height method.
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Value Tiers
| Tier | What You Get | Suitable For |
|---|---|---|
| Basic | Single filament, manual swap | Budget Creators |
| Intermediate | Multi-part color design, assisted by software | Students, Hobbyists |
| Pro | Dual/multi-extruder seamless prints | Businesses, Freelancers |
Final Thoughts
Multi-colour 3D printing isn’t just a gimmick—it’s a powerful tool for storytelling, branding, and functional clarity. Whether you’re a designer wanting visual flair or a business adding polish to a prototype, mastering multi-colour FDM printing opens doors.
Don’t let colour limit your creativity. Start experimenting today—and if you’re stuck, TrinityLayers has your back.