The frame of the coffee table includes an outer loop for train storage. Before flipping the model upside-down, ... 3D Printed Train Set Aims For Speed. May 12, 2020 by Lewin Day 32 Comments ...

To ensure the train isn’t subjected to the forces of gravity, Waldraff incorporated a hidden siding track that runs around the inside walls of the coffee table.

The frame of the coffee table includes an outer loop for train storage. Before flipping the model upside-down, the train itself is sent to this siding for safe keeping.