TP Tube 3D Printed Marble Run

This design is for connector pieces that can be printed quickly for use with toilet paper tubes to create a marble run. Every other marble run I found on thingiverse was either for smaller ball bearings or took hours and hours to print! This is a simple marble run using toilet paper tubes cut into fourths as the tracks. Could easily be remixed for different combinations and configurations!

Uses standard 16mm marbles.

For one track, print 1 Top, 1 Bottom, 8 Adaptors, 3 Up, 3 Down and