Test Track
14 Jan 2026 | by Marta
This is an experimental linear marble track designed specifically for 12.7mm (1/2 inch) steel ball bearings.
🛠️ Project Details
- Ball Size: 12.7 mm (0.5 inch) marbles.
- STL file
- Onshape model

I created this model as a reference tool to investigate optimal track tolerances, rolling resistance, and fit for this specific marble size. It is a great starting point if you are designing a larger marble run and need to test how the ball interacts with the rails before committing to a massive print.
Ideas:
- Purpose: Testing track width, depth, and friction.
- Design: Minimalist, low-profile linear rail.