DIY String Alignment System – Race Developed Design (3D Printed Components Only)
Build your own professional-grade string alignment system using the same design I\'ve developed and used over multiple racing seasons on my BMW E36 M3 race car.
This setup will allow you to easily measure and adjust individual wheel toe, total toe, thrust angle and caster.
This listing includes the 3D printed components only. Tubing, hardware, and string are not included. Selling the printed components separately keeps shipping costs reasonable and allows buyers to source commonly available materials locally.
This system has been refined through real-world track use and has been used to set up a race-winning car, providing accurate and repeatable alignment measurements without the need for an expensive alignment rack.
What\'s Included
All threaded features are designed to accept M8 x 1.25 thumb screws or set screws.
Material Required (Not Included)
The following tubing dimensions have been tested and are suitable for the vast majority of street cars, sports cars, race cars, autocross cars, and full-size pickup trucks.
Square Tubing
Material:
Cut List:
(8) pieces at 32\"
(2) pieces at 48\"
Round Tubing
Material:
Cut List:
Additional Items Required
String Recommendation
For the greatest accuracy, I recommend using high-visibility monofilament fishing line.
My personal setup uses:
8 lb test monofilament
0.18 mm diameter
Orange color
This provides excellent visibility while maintaining a very straight and precise reference line.
If improved visibility is preferred, a larger diameter line can also be used.
Universal Mounting Hooks
The mounting hooks are designed to work on the vast majority of vehicles and can typically be attached to:
The design allows the frame to be positioned around a wide variety of vehicle types.
String Bar Preparation
The round tubing used for the string bars requires six precision-spaced notches to be cut into each tube for proper string placement.
Detailed instructions are provided through a QR code included with every purchase.
The guide includes:
Why Use a String Alignment System?
String alignments remain one of the most effective methods of measuring and adjusting vehicle toe.
Benefits include:
No alignment rack required
Portable and easy to transport
Repeatable measurements
Ideal for race cars and track-day vehicles
Excellent for garage and trailer-side adjustments
Allows quick verification of alignment changes between events
Proven Race Car Development Tool
This design was not created as a display piece or hobby project. It was developed through actual race car setup and testing.
Photos included in this listing show the system installed and being used on my BMW E36 race car.
Material & Manufacturing
All components are manufactured from durable PETG material and printed with strength and longevity in mind.
Due to the nature of 3D printing, minor cosmetic variations may be present. These do not affect functionality.
Important Notes
This listing is for the 3D printed components only.
Tubing, hardware, measuring equipment, alignment string, and vehicle shown in photos are not included unless specifically stated otherwise.
Please review the required materials list before purchasing.
If you have questions about compatibility with your vehicle or build, feel free to contact me before ordering.
