Replacement gear(s) to fit with Lakeshore Engineer-A-Coaster Activity (available for purchase at: https://www.lakeshorelearning.com/products/stem/building-engineering/engineer-a-coaster-activity-kit/p/LL570/ )
Print the size you need. Supports required.
The author remixed this model.
Modified size and scale for small, medium and large versions; Changed the middle section shape to fit with the Engineer-A-Coaster Activity track