As a 3D printing enthusiast, I'm always looking for ways to expand the capabilities of my open‑source printer. One of the most exciting advancements in recent years has been the development of multi‑material and multi‑colour printing systems. These innovative solutions allow you to combine different filaments in a single print – whether that means printing in multiple colours, materials with distinct properties, or even both.
However, with so many options now available, choosing the right system can be overwhelming. That’s why I’ve put together an overview of some of the most popular and promising options on the market today, including the BoxTurtle, ERCF, TradRack, NightOwl, Bondtech INDX (coming soon), and the LDO Stealth Changer.
TDLR:
- BoxTurtle and NightOwl offer space‑efficient designs.
- ERCF and TradRack provide greater expandability and more colours at lower cost.
- If you’re after a future‑proof, flexible, and fast tool‑changer system, Bondtech INDX is shaping up to be an industry game‑changer – a more polished finished product compared to DIY kits like the Stealth Changer.
- For Voron 2.4 users who need a modular toolhead swap solution today, the LDO Stealth Changer is the better option.
Multi-Material or Multi-Colour Systems
Before diving into the specific systems, it's important to understand the difference between multi-material and multi-colour printing:
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Multi-Colour Printing refers to using multiple colours of the same/similar material in a single print. This is great for decorative models, logos, or branding elements or just simplifying loading and auto change filament when its runs out.
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Multi-Material Printing, on the other hand, involves printing with different filament types, such as combining PLA with TPU, PETG, or even carbon fibre-infused materials. This allows for functional designs that require varying mechanical or thermal properties within the same part or easier support removal with interface layer that does not adhere to each other or dissolving for more complex supports.
Some systems focus on colour swapping; others allow for true multi-material printing. A few advanced setups can handle both as its later multi materials print using different toolhead/hotend.
Popular Multi Colour Systems
BoxTurtle
Developed by the team at ArmoredTurtle, the BoxTurtle is a compact, easy-to-use system that can handle up to four filaments. It integrates seamlessly with the AFC Lite by xbst, and is ideal for Klipper-based setups. Communication can be established via USB or CANBus, making it a flexible option for most open-source printer builds. Its has one better documentation/build guides with a interactive manual and larger community.
Project Information: https://github.com/ArmoredTurtle/BoxTurtle
ERCF (Enraged Rabbit Carrot Feeder)
A well-known community project, the ERCF can manage up to six or more filaments. Its modular, open-source design allows for deep customisation. This system is popular for users who want both functionality and flexibility, especially in Klipper environments. Although build wise, its can complex build for a first time builder, its can take up more space compare to other solution, but far more module are you can use re-spooler or buffer systems.
Project Information: https://github.com/EtteGit/EnragedRabbitProject
TradRack
The TradRack is similar to ERCF but more stable as its use slightly less printed parts and use linear rails instead of linear rods. Supporting up to 14 channels, it's a powerhouse for users seeking scale and reliability. Although build wise difficulty, its can complex build for a first time builder similar skills and similar difficulty as ERCF, in our opinion is better option compare to ERCF but the community is far smaller compare to ERCF.
Project Information: https://github.com/Annex-Engineering/TradRack
NightOwl
NightOwl by mjonuschat is a simpler dual-filament switcher. It’s cost-effective and relatively easy to integrate with existing system. While limited to two spools, it’s an excellent entry point for those wanting to explore filament switching without complex mechanics or limited space. Although its lacks some documentation regarding assembly for some parts, which require referencing CAD files for the assembly which out of all above listed option is not recommended for first time builders. Otherwise its more cost effective system, where the end goal is having auto buffer roll over system, or doing automated 1 colour change for basic logo/text.
Project Information: https://github.com/mjonuschat/NightOwl
Popular Multi Material Systems
Bondtech INDX (Coming Soon)
Bondtech INDX is an advanced, hot-end‑less tool‑changer system currently in development, with an expected release around Q2-3 2026 for retail. It promises to revolutionise multi-material and multi-nozzle 3D printing with a fast, lightweight, and efficient design. Its more cost effective option, as the each additional tool is passive so the cost is much lower compare to traditional tool changer.
More Info: https://www.bondtech.se/indx-by-bondtech/
LDO Stealth Changer (Based on DraftShift Design)
The LDO Stealth Changer is a modular tool-changing system for the Voron 2.4, based on the open-source StealthChanger project from DraftShift Design. It supports up to five or six toolheads depending on printer size (300 mm vs. 350 mm), the downside is the cost, as more toolhead you plan to add the higher cost compare to Indx which use passive tool which is much more cost effective as more toolhead you add.
Subs Kits: https://shop.dremc.com.au/ldostealthchanger
Project Information: https://stealthchanger.com/
Why Go Multi-Material?
The benefits of multi-material and multi-colour printing go beyond aesthetics. For example, you can:
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Print flexible TPU over rigid PLA for grippy surfaces
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Combine dissolvable supports for clean overhangs such as PVA/HIPS
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Produce functional assemblies in a single print
This opens up possibilities in prototyping, robotics, wearable, and more.
Choosing the Right System
When selecting a system, consider:
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Your printer’s firmware (Klipper, etc.)
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Available space, hardware compatibility and budget
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Number of materials/colours you want to use
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Budget and willingness to tinker
Final Thoughts
The world of multi-material and multi-colour 3D printing continues to grow, powered by innovation from the open-source community. Whether you're after vibrant prints or high-performance parts, there's a system out there to match your needs. Systems like BoxTurtle and NightOwl offer space efficient, while ERCF and TradRack provide greater expandability and more colours at lower cost.
If you’re interested in a future-proof, flexible, and lightning-fast tool changer system, Bondtech INDX is shaping up to be an industry game-changer. Its more polished finished product compare to DIY Kit like Stealth Changer. For Voron 2.4 users looking for modular toolhead swap solution today, the LDO Stealth Changer is better option.
Why not give it a try? With the right setup, your next project could be your most creative and functional yet.
Happy printing!
