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Stepped Tube Adapter Mock-up Planner – Imperial (Inch) – Single Transition Bundle (3D Printable)

Now €24.95 Was €34.95
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Explore different transition geometries without changing your tube sizes!

This 3D printable stepped tube adapter Single Transition Bundle gives you all successfully validated configurations for one selected imperial tube diameter transition.

Choose from 20 available imperial tube diameter transitions. Once you have selected the transition required for your project, the bundle gives you all successfully validated combinations of transition angles and CLR ratios available for those two tube diameters.

Originally developed for custom exhaust fabrication, the system is also ideal for intake and charge piping, custom frames and other tubular fabrication projects where a change in tube diameter needs to be incorporated into the route.

Print the configurations you need and physically compare different transition geometries while checking fitment, clearance, routing and geometry before cutting or welding any metal.

Each adapter is clearly marked with its lower and upper tube diameters, total transition angle and CLR ratio, making the different configurations easy to identify.

One Transition, Multiple Configurations

Select the imperial tube diameter transition required for your project and receive all successfully validated angle and CLR combinations available for that transition.

This is ideal when you already know the two tube diameters you are working with but want the freedom to experiment with different transition geometries before fabrication.

Need the entire library? The Complete Imperial Bundle contains all 209 successfully validated imperial configurations across all 20 available diameter transitions.

What You’ll Get

✔ All configurations shown for your selected imperial tube transition
✔ Multiple transition angles and CLR ratios
✔ High-quality, print-ready 3D models
✔ Clearly marked diameter, angle and CLR information
✔ Snap-fit connection for use with the Futuri tube mock-up system
✔ Designed to print reliably with standard filaments such as PLA and PETG
✔ Compatible with most FDM 3D printers
✔ Optimized for easy, reliable printing
✔ Recommended print settings and instructions

Snap-Fit Modular Design

The stepped adapters are designed to work with the Futuri Pie-Cut Tube Mock-up Planner system, allowing diameter transitions to become part of a complete physical tube mock-up.

The snap-fit connection uses 24 rotational positions, spaced at 15° intervals, allowing connected pieces to be rotated and positioned while planning the tube route.

Available Imperial Transition Bundles

Each row represents one available Single Transition Bundle. The angles shown under each CLR ratio are the configurations included in that bundle.

Tube Transition0.75D1.0D1.25D1.5D2.0D
1.250 → 1.375″××15°, 18°15°, 18°9°, 15°, 18°
1.250 → 1.500″×18°15°, 18°15°, 18°9°, 15°, 18°
1.375 → 1.500″×18°15°, 18°9°, 15°, 18°9°, 15°, 18°
1.375 → 1.625″×18°15°, 18°15°, 18°9°, 15°, 18°
1.500 → 1.625″×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
1.500 → 1.750″×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
1.625 → 1.750″×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
1.625 → 1.875″×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
1.750 → 1.875″×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
1.750 → 2.000″×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
1.875 → 2.000″×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
1.875 → 2.125″×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
2.000 → 2.125″×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
2.000 → 2.250″×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
2.125 → 2.250″×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
2.250 → 2.500″×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
2.500 → 2.750″18°15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
2.750 → 3.000″18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
3.000 → 3.500″18°15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
3.500 → 4.000″18°15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°

× = No configuration available at this CLR ratio

CLR Ratio Guide

The centerline radius (CLR) ratio determines the curvature of the transition. A lower CLR creates a tighter geometry, while a higher CLR produces a longer, more gradual transition.

CLR RatioTransition Geometry
0.75DVery tight
1.0DTight
1.25DMedium
1.5DLong
2.0DSweeping

CLR is expressed as a multiple of the tube diameter. For example, a 2.000″ tube with a 1.5D CLR has a centerline radius of 3.000″.

Print as Many Pieces as You Need

All included models are digital files. Print whichever configurations you need and produce as many physical adapters as required for your own projects and fabrication work.

Instant Download

After purchase, you will receive an email with a download link so you can start printing right away.

Digital Product & Licence

This is a digital download, so no product will be shipped. You’ll need a 3D printer to make the tool yourself.

You’re welcome to print the tool as many times as you need for your personal projects or use in your own professional workshop, including paid work on customers’ motorcycles.

If you’d like to sell or distribute printed copies of the tool, please contact Futuri Motion Tech first to obtain written permission.

The digital files are for your own use and may not be shared, uploaded, redistributed, copied for others or resold. This also applies to modified versions. All intellectual property rights remain with Futuri Motion Tech.

Each file is individually digitally watermarked when generated or downloaded, allowing unauthorised sharing to be traced back to the original purchase.

For the full licence conditions, please see Section 8 of our Terms and Conditions.

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