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Stepped Tube Adapter Mock-up Planner – Imperial (Inch) – Exhaust & Fabrication (3D Printable)

$11.28
USD flag USD

Plan tube diameter transitions before cutting a single piece of metal!

This 3D printable stepped tube adapter mock-up planner lets you physically plan, test and visualise transitions between two different tube diameters before fabrication.

Originally developed for custom exhaust fabrication, the system is also ideal for intake and charge piping, custom frames and other tubular fabrication projects where the tube diameter changes along the route.

Select your required imperial tube diameter transition, transition angle and CLR ratio to create a mock-up adapter matching your actual tubing. The adapter allows you to physically test the transition and check 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 configurations easy to identify and helping you transfer your finished mock-up directly to the real fabrication.

Choose Your Configuration

Choose from 20 available imperial tube diameter transitions, then select your transition angle and centerline radius (CLR) ratio to define the geometry of the adapter.

Your download contains the 3D printable model for that specific configuration. Only successfully validated combinations are available, giving you 209 individual imperial configurations to choose from.

Need more flexibility? Single Transition Bundles contain all validated angle and CLR combinations for one selected diameter transition, while the Complete Imperial Bundle gives you the complete validated imperial library.

What You’ll Get

✔ High-quality, print-ready 3D model
✔ Your selected imperial tube transition, angle and CLR ratio
✔ 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 Configurations

The table below shows the available transition angles for each tube transition and CLR ratio. Choose your required tube transition, angle and CLR ratio from the product options.

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

Your purchase includes the digital model for your selected configuration. Print the adapter as many times 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 & License

This is a digital product, not a physical item. No product will be shipped. A 3D printer is required to create the adapter yourself.

The files may be used for personal projects as well as professional and commercial work. You may print the design as many times as needed for your own projects and fabrication work.

The digital files themselves may not be shared, redistributed, uploaded, copied for others or resold. All intellectual property rights remain with Futuri Motion Tech.

Each file is individually digitally watermarked upon generation/download, allowing unauthorized distribution to be traced back to the original purchase.

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