Modular Marble Run Kit

A simple modular marble run kit for 16mm glass marbles, with potential for further parts to be added.

Specifications as follows: Each piece has a height of 30mm, with 18mm diameter channels. The straight pieces are 26mm wide but this can vary from piece to piece. The outside diameter of the inlet and outlets is also 26mm and it's preferable to maintain this where appropriate. The top of each section has a prominence that encircle the marble channel with a height of 1.3mm and diameter 21.2mm.