28.5mm Spacer for Marble Genius set

Made this after printing https://www.thingiverse.com/thing:250165 and discovering it didn't fit the standard connector height of the Marble Genius sets. Attaching this (x3) to the bottom will make the section the equivalent of 2 connectors in height on the corners. The center will still be 2mm too high, but that's the original thing's design.