76 mm / 3 in Pie Cut Pipe Cutting Template STL Set – 7 Angles for Lobster Back Exhaust Bends

Complete 7-piece digital STL set of reusable Pie Cut Pipe Cutting Templates designed for 3 in round tubing, commonly referenced as approximately Ø76 mm.

These 3D printable workshop templates are designed for marking accurate angled cuts on straight tubing so individual sectors can be assembled and welded into pie-cut, lobster-back and segmented tube bends.

TUBE OUTSIDE DIAMETER:

3 in / approximately 76 mm

3 in = 76.2 mm.

The Ø76 mm value is used as the rounded metric reference for this tubing size.

INCLUDED CUTTING ANGLES:

• 7.5°
• 10°
• 11.25°
• 15°
• 18°
• 22.5°
• 45°

ALL 7 STL templates are included in this single listing.

Each Pie Cut Pipe Cutting Template slides directly onto the tube and provides a reusable physical guide for marking the required angled cutting line around the tube circumference.

The cutting angle is built directly into each template, making it possible to reproduce the same cut repeatedly when preparing multiple sectors for one segmented bend.

Straight tubing can therefore be used to fabricate custom elbows and complex bends without relying only on pre-formed mandrel bends.

HOW TO USE:

1. Select the required cutting-angle template.
2. Slide the template onto the 3 in / approximately 76 mm tube.
3. Position it at the required cutting location.
4. Align the template correctly.
5. Trace the complete angled cutting line with a marker.
6. Remove or move the printed template away from the cutting area.
7. Cut along the marked line using an angle grinder, bandsaw, hacksaw or another suitable metal-cutting tool.
8. Deburr and finish the cut edge.
9. Repeat the process to prepare the required number of sectors.
10. Rotate and arrange the sectors to form the desired bend.
11. Tack weld the pieces together.
12. Check the complete bend geometry before final welding.

SUITABLE FOR MAKING:

• Pie cut exhaust bends
• Lobster back bends
• Segmented tube bends
• Custom exhaust elbows
• Tight-radius exhaust sections
• Turbo piping
• Turbo downpipes
• Wastegate tubing
• Exhaust collectors
• Intake piping
• Charge piping
• Custom motorsport tube assemblies

The different cutting angles provide flexibility when designing the finished bend.

Smaller-angle sectors can be used to create smoother curves with more individual welded pieces.

Larger-angle sectors provide a greater change in direction with fewer sections.

This fabrication method is especially useful when:

• A standard mandrel bend does not fit
• A custom bend radius is required
• Installation space is limited
• Complex exhaust routing is needed
• Straight tubing is being used to fabricate a bend
• A pie-cut / lobster-back appearance is desired
• A one-off exhaust or turbo system is being built

COMMON APPLICATIONS:

• Performance exhaust fabrication
• Stainless steel exhaust systems
• Large-diameter exhaust tubing
• Turbo exhaust systems
• Exhaust manifolds
• Turbo manifolds
• Exhaust collectors
• Motorsport fabrication
• Automotive fabrication
• Motorcycle fabrication
• Drift cars
• Track cars
• Race vehicles
• Hot rods
• TIG welding
• MIG welding
• General tube fabrication

3 in tubing is widely used in high-performance exhaust systems, turbo applications and custom automotive fabrication, making this template set useful for professional workshops and individual fabrication projects.

Once printed, all seven templates can be stored in the workshop and reused whenever the same tube diameter and cutting angle are required.

DIGITAL PRODUCT ONLY.

This listing contains SEVEN digital STL files for 3D printing.

No physical templates, metal tubing, finished pie-cut sectors, exhaust bends, welding equipment or cutting tools are included.

IMPORTANT:

The primary reference diameter for these templates is 3 in outside diameter.

3 in corresponds to 76.2 mm, commonly rounded to approximately 76 mm for reference.

Always measure the actual outside diameter of your tubing before printing.

Tube manufacturing tolerances, welded seams, surface coatings, filament shrinkage and 3D printer calibration can affect the final template fit.

The printed templates are marking guides only.

Always remove the plastic template before cutting, grinding or welding.

Test-fit the metal sectors and verify the complete bend geometry before final welding.

Product:
Pie Cut Pipe Cutting Template STL Set

Also suitable for:
Lobster Back / Segmented Tube Bend Fabrication

Tube outside diameter:
3 in / 76.2 mm

Rounded metric reference:
Approximately 76 mm

Included files:
7 individual STL cutting templates

Included cutting angles:

7.5°
10°
11.25°
15°
18°
22.5°
45°

File format:
STL digital 3D printing files

SIZE REFERENCE:

The primary tube size for these models is:

3 in OD

3 in = 76.2 mm.

The Ø76 mm value is used as a rounded metric reference.

PRINT SCALE:

Import all STL files at 100% / 1:1 scale.

Do not resize the models unless you intentionally want to adapt them for another tube diameter.

Before printing, confirm that your slicer has imported the STL files in millimetres and has not applied automatic scaling.

RECOMMENDED PRINT MATERIALS:

• PETG – recommended for general workshop use
• ABS – suitable for durable fabrication tools
• ASA – suitable for durable and more temperature-resistant workshop use
• PLA – suitable for test prints and light-duty use

RECOMMENDED STARTING PRINT SETTINGS:

• Layer height: approximately 0.20 mm
• Walls / perimeters: 3–4 or more
• Infill: approximately 20–40%
• Sufficient top and bottom layers for good rigidity
• Print scale: 100%
• Supports normally not required with suitable model orientation

Exact print settings depend on your printer, nozzle diameter, filament and slicer.

BEFORE PRINTING THE COMPLETE SET:

1. Measure the actual outside diameter of your tubing.
2. Confirm that it is approximately 3 in / 76.2 mm.
3. Import one STL into your slicer.
4. Confirm millimetre units.
5. Verify that no automatic scaling has been applied.
6. Keep the model at 100% scale.
7. Print one template first.
8. Test the fit directly on the actual tube.
9. Confirm that the template slides correctly and remains stable enough for accurate marking.
10. Print the remaining six templates after confirming the fit.

POSSIBLE CAUSES OF INCORRECT FIT:

• Tube manufacturing tolerance
• Weld seam
• Paint or coating
• Filament shrinkage
• Printer dimensional calibration
• Extrusion calibration
• XY / horizontal expansion
• Incorrect slicer scaling
• Incorrect unit conversion

WORKSHOP USE:

Slide the required template onto the tube and trace the angled cutting line with a marker.

The printed template is intended as a MARKING GUIDE.

Do not cut directly against the plastic edge using an angle grinder or cutting disc.

Remove or move the template away before cutting.

After cutting each sector:

• Deburr the cut edges
• Check the mating surfaces
• Test-fit the sectors
• Arrange the required bend geometry
• Tack weld the pieces first
• Recheck alignment and total bend angle
• Complete the final weld only after confirming the finished shape

For stainless steel exhaust fabrication, use an appropriate welding procedure and internal shielding / back purging where required.

Keep the printed templates away from grinding sparks, freshly welded tubing, hot metal and open flame.