Design and plan custom exhaust systems before cutting a single piece of metal

This 3D printable 18° pie-cut segment is designed for exhaust builders who want to plan, test, and visualise custom exhaust layouts before fabrication. Multiple segments can be snapped together to build full exhaust runs in any direction and length.

Each printed segment includes clear angle markings, allowing you to physically assemble a full exhaust layout, take it to the workbench, and directly replicate the design in metal with precision.

The industry standard for pie-cut fabrication is 18° per segment, which provides an ideal balance between flexibility and control when forming complex bends. Each segment features a 7mm minimum wall height on the tight side, allowing for tight-radius bends while still leaving enough material for strong, reliable welds between sections.

By assembling different configurations, you can check fitment, visual appearance, angles, and overall feasibility before committing to metalwork. This significantly reduces wasted material, rework, and fabrication time by moving all design decisions to the planning stage.

The model is available in multiple sizes to match different tubing diameters. The selected size must correspond to the outer diameter of the tubing you intend to use, ensuring accurate real-world fitment when transferring the design to metal.