The extendable Gravitrax-compatible rails are a fantastic way to add even more dynamics and design freedom to your marble run. I printed these modular elements in various colors – and I’m absolutely thrilled with how well they work while adding vibrant visual accents.
What makes these rails so special?
The model “Extendable Rail Marble Track – Gravitrax Compatible” by designer **nebulousflynn** offers a clever solution for anyone who needs more flexibility between elements. Thanks to a simple plug-in system, the rails can be adjusted in length and easily integrated into existing Gravitrax tracks.
What’s especially exciting: the combination of different length sections and colors not only makes technical sense but also looks really cool.
My printing experience with the flexible rails
I printed the rails using my Bambu Lab X1 Carbon (link) in multiple colors. This not only helps organize track planning (e.g., color-coded by function or length), but also creates a modern, personalized design.
👉 My setup tips:
- Material: PLA (works great, especially with precise printing)
- Layer height: 0.2 mm
- Infill: 10–15%
- Support: not required
- Print time: depending on the element, between 20 and 45 minutes
The parts fit together very well, are slightly flexible, and sturdy enough to safely guide longer stretches. Especially for creative layouts or when you need to bridge small gaps, these parts are worth their weight in gold.
Gravitrax compatible rails
Advantages when combined with other 3D printed extensions
In our setup, we combine the flexible rails with the Gravitrax-compatible spacer towers and the Electric Marble Lift V4a – a perfect combination for maximum creativity.
The flexible rails help extend the track or elegantly overcome height differences, while the spacers provide a stable framework and the lift keeps the marble circuit going.
Here’s a short video of one of our home setups:
If you don’t have the ability to print such rails yourself, you can also buy a compatible extension set. We use one of those alongside our 3D printed long rails – especially since short rails are often the most needed to create exciting action on the track.
Conclusion: Colorful, modular, and extremely useful
The extendable Gravitrax-compatible rails are a true asset for any custom marble run. Thanks to their modular design, easy printability, and stylish color variations, they’re not only practical but also a real eye-catcher on any track. They’ve become essential in our home – and we highly recommend them!
🔗 Check out the model here: Extendable Rails on Printables
Gravitrax is a registered trademark of Ravensburger AG. This post is not affiliated with Ravensburger AG and uses the brand solely to describe compatibility.
This article was written by a human with the help of AI.
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