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Stepped Tube Adapter Mock-up Planner – Complete Bundle – Metric & Imperial (3D Printable)

Now $67.94 Was $135.88
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Plan tube diameter transitions before cutting a single piece of metal!

This complete 3D printable stepped tube adapter mock-up planner gives you a comprehensive library of adapters for physically planning, testing and visualising tube diameter transitions before fabrication. Choose the Metric Complete Bundle, Imperial Complete Bundle, or the combined Metric + Imperial Complete Bundle.

Originally developed for custom exhaust fabrication, the system is also ideal for intake and charge piping, custom frames and other tubular fabrication projects where different tube diameters need to be connected.

The library covers multiple tube diameter transitions, transition angles and CLR ratios, allowing you to experiment with different geometries and physically 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.

Complete Metric & Imperial Libraries

Choose the library that matches the tubing you work with:

  • Metric Complete Bundle – 28 diameter transitions and 279 successfully validated configurations

  • Imperial Complete Bundle – 20 diameter transitions and 209 successfully validated configurations

  • Metric + Imperial Complete Bundle – both complete libraries with 488 successfully validated configurations

Each library includes the successfully validated combinations of transition angles and CLR ratios available for its diameter transitions.

This is the ideal option for fabricators who regularly work with multiple tube sizes and want the complete stepped-adapter library without purchasing individual configurations or Single Transition Bundles separately.

What You’ll Get

✔ Complete configuration library for your selected bundle
✔ 279 Metric, 209 Imperial, or 488 Metric + Imperial configurations
✔ 28 Metric and/or 20 Imperial tube transitions
✔ 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.

Choose Your Complete Bundle

Choose the library that matches the tubing you work with:

  • Metric Complete Bundle – 28 tube transitions and 279 configurations
  • Imperial Complete Bundle – 20 tube transitions and 209 configurations
  • Metric + Imperial Complete Bundle – all 48 tube transitions and 488 configurations

The configuration matrices below show exactly what is included in each library.

Metric Configuration Library

Tube Transition0.75D1.0D1.25D1.5D2.0D
30 → 32 mm××15°, 18°15°, 18°9°, 15°, 18°
30 → 35 mm××15°, 18°15°, 18°9°, 15°, 18°
32 → 35 mm××15°, 18°15°, 18°9°, 15°, 18°
32 → 38 mm×18°15°, 18°15°, 18°9°, 15°, 18°
35 → 38 mm×18°15°, 18°9°, 15°, 18°9°, 15°, 18°
35 → 40 mm×18°15°, 18°15°, 18°9°, 15°, 18°
38 → 40 mm×18°15°, 18°15°, 18°9°, 15°, 18°
38 → 42 mm×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
40 → 42 mm×18°15°, 18°9°, 15°, 18°9°, 15°, 18°
40 → 45 mm×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
42 → 45 mm×18°15°, 18°9°, 15°, 18°9°, 15°, 18°
42 → 48 mm×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
45 → 48 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
45 → 50 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
45 → 50.8 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
48 → 50 mm×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
48 → 50.8 mm×15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
48 → 54 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
50 → 50.8 mm×9°, 15°, 18°15°, 18°9°, 15°, 18°9°, 15°, 18°
50 → 54 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
50.8 → 54 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
54 → 57 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
54 → 60 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
57 → 60 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
57 → 63.5 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
60 → 63.5 mm×15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
63.5 → 70 mm18°15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°
70 → 76.2 mm18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°9°, 15°, 18°

Imperial Configuration Library

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 50 mm tube with a 1.5D CLR has a centerline radius of 75 mm, while a 2.000″ tube with a 1.5D CLR has a centerline radius of 3.000″.

Print as Many Pieces as You Need

Unlike a physical mock-up kit with a fixed number of pieces, the Complete Bundle provides the digital models themselves. Print whichever configurations you need, whenever you need them, 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 & License

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

The files may be used for personal projects as well as professional and commercial work. You may print the designs 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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