1. The Challenge of Color Printing
Since the first 3D printers appeared on desks, users have dreamed of being able to easily print a single object from multiple colors or materials. Whether it’s creating a colorful figurine, incorporating a flexible grip into a rigid tool, or using a special material for supports, the goal has always been the same: greater creative freedom.
Historically, however, achieving this goal meant significant compromises. Early multi-material systems were often slow, incredibly wasteful of filament, or so expensive that most hobbyists and professionals couldn’t afford them.
The INDX system, born from an exclusive partnership between Prusa Research and extrusion experts from Bondtech, is a revolutionary solution designed to solve precisely these problems. It introduces a groundbreaking architecture that aims to deliver speed, efficiency, and scalability without compromise. This new approach elegantly bypasses traditional pitfalls, opening up a more practical and powerful future for multi-material printing.
2. Where Does INDX Fit In?
To understand why the INDX system is such a breakthrough, it’s good to look at existing multi-material printing methods. Each has its way of solving the problem, but also its own set of disadvantages.
| Technology | How It Works | Common Disadvantages |
| Filament Switchers (like MMU/AMS) | A single hotend retracts one filament and loads another with each material change. | Slow and wasteful of material due to constant loading, unloading, and purging (wiping) of old color. |
| Full Tool Changers (like Prusa XL) | The entire print head (motor, heater, nozzle) is physically swapped out for another. | Moving print heads are heavy, complex, and very expensive, making systems with more tools costly. |
| INDX Hybrid System | One “Smart Head” picks up and activates one of several simple, inexpensive, and passive tools. | Designed to eliminate the disadvantages of both previous systems. |
The INDX system was created to fill a gap in the market, providing the best of both worlds. To achieve this, its creators came up with a brilliantly simple idea.
3. An Electric Shaver for Your 3D Printer
The simplest way to understand the INDX system is to think of it like a modern electric shaver: there’s one “smart body” that contains all the expensive technology, and it uses multiple simple, inexpensive, and replaceable “blades” to do the actual work.
3.1. The Brain of the Operation
The Smart Head is the “body of the shaver.” It’s the only active component that moves above the print bed. This single head contains all the complex and expensive technology:
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The extruder drive system.
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Inductive heating.
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An automatic belt tensioning mechanism.
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All sensors and associated electronics.
Because there is only one Smart Head, the moving part of the printer remains light and efficient, allowing for fast and precise movements.
3.2. Simple, Replaceable Blades
The Passive Tools are those inexpensive, replaceable “blades.” These tools are parked in the printer, waiting for the Smart Head to pick them up. They are beautifully simple, wireless, and contain:
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No electronics.
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No wires.
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No heating elements or thermistors.
Their sole purpose is to guide a specific filament into a special nozzle. Because these tools are mechanically so simple, they are incredibly cost-effective. This elegant design is what makes an 8-tool system affordable and scalable for the first time.
But how is this elegant division of labor possible? The magic is powered by two groundbreaking innovations hidden inside the Smart Head.
4. Two Key Innovations
The name INDX isn’t just a name; it’s a direct reference to the two foundational technologies that make the entire system possible: “IN” for INductive heating and “DX” for Dynamic eXtruder.
4.1. The Power of Induction (“IN”)
Instead of a traditional heating block, the INDX system uses contactless induction. When the Smart Head picks up a Passive Tool, an induction coil inside the head creates a high-frequency magnetic field that instantaneously heats the nozzle on the tool without any physical connection. And here’s where it truly gets magical: the Smart Head also measures the nozzle’s temperature without any contact or wires, allowing for precise control of a completely wireless, passive tool. This brings two critical advantages to the user:
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Ultra-Speed: The nozzle heats from room temperature to operating temperature in mere seconds. This dramatically reduces wasted time during tool changes.
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Mess Elimination: Equally important, the nozzle cools almost instantly when the tool is parked. This is the “holy grail” for multi-material printing, as it completely prevents annoying dripping and oozing plastic from inactive tools – a common source of print failures in other systems.
4.2. The Dynamic eXtruder (“DX”)
Anyone who has printed with both a rigid material like PLA and a soft, flexible material like TPU knows that they require very different levels of pressure or “tension” from the extruder’s drive gears. This usually necessitates manual adjustments or a compromise that doesn’t work perfectly for either.
The Dynamic eXtruder (“DX”) solves this problem entirely. It’s a self-adjusting system that requires no user intervention, achieved through a clever reactive cam mechanism. When the extruder detects increased backpressure (for example, when printing with high flow rates), the cam mechanically translates that force into a stronger grip. For soft, flexible filaments, it uses a gentler squeeze. This ensures a flawless and reliable grip every time. This entire system is a brilliant piece of engineering: the same lightweight motor that drives the filament also powers this mechanism and opens the gears to release the filament during tool changes. It’s one motor performing three different functions.
Together, these technologies create a seamless, fast, and remarkably clean multi-material printing experience.
5. Real-World Benefits of INDX
All this advanced technology translates into four simple yet powerful benefits for the end-user:
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Unmatched Speed: The entire process – parking the current tool, picking up the next, heating to temperature, and resuming printing – can take as little as 12 seconds.
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Minimal Waste: Unlike filament switching systems that create large “wipe towers” of purged plastic, the INDX system is exceptionally efficient. Almost all of your filament ends up in the final print.
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Maximum Flexibility: Effortlessly print with up to 8 different colors or materials in a single job. The self-adjusting extruder provides a reliable grip on everything from standard plastics to challenging flexible filaments.
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Affordability & Scalability: Thanks to the low cost of Passive Tools, you can start with a 4-tool setup and easily expand to a full 8-tool system later without breaking the bank.
Now that you see what INDX can do, you’re probably wondering one thing: how do you get this incredible technology for your printer?
6. How to Get the INDX Upgrade
The Bondtech INDX is being launched with a clear two-phase plan. Here are the key details:
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Target Printer: INDX is an upgrade designed exclusively for the Prusa CORE One 3D printer.
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Launch Date: Initial units are expected to ship in Q1 2026.
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Two-Phase Rollout: The upgrade will first be available as a “Founders Edition” kit directly from the Bondtech website. In the second phase, it will also be sold on the official Prusa e-shop.
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Estimated Price: Preliminary European pricing is €499 for a 4-tool kit and €699 for an 8-tool kit. This affordability is made possible by the low anticipated cost of individual Passive Tools (around €35 each), underscoring the system’s scalable design.
For owners of the larger CORE One L printer, the future looks even more expansive, with plans for potential system expansion to a total of ten tools.
7. A New Era for Multi-Material Printing
The Bondtech INDX system represents a major leap forward in 3D printing. By rethinking the fundamental architecture of the toolchanger, it finally eliminates the traditional compromises between speed, waste, flexibility, and cost. It takes the best ideas from previous systems and combines them into an elegant, efficient, and brilliantly simple solution. For everyone from beginners to printing professionals, INDX makes advanced, multi-material 3D printing more accessible and practical than ever before.
PS: We print gadgets and tools for the teambuilding company Z-AGENCY and the gaming platform TerraHunt. Listen to our podcast about 3D printing.
