Gravitrax compatible starter/launcher

This is a version 1 starter/launcher that is Gravitrax compatible. This is a non-magnetic launcher that relies on keepers and gravity for launching. This model requires a 5/16" compression spring (cut in half) that you can get at ACE. See photos for details. When you slice the .stl models, be sure to flip the Cap, Cap retainer and Insert 180 degrees.