junction connector for Marble Race.Hi to all, this is a part of an open project.. that start here :) The goal is to create a modular track for classic glass marbles. (16 mm diameter), but not only.Everyone can partecipate with fantasy, creating parts of the track, doing this "puzzle track" more and more funny.message me if you have question about.NOTE: soon I'll leave parametric measures of pieces, to let people add their own creations.