The organizer is a simple plate with 8x3 Slots for Gravitrax elements, and can store up to 24 elements. Even most special elements fit, although they will block other slots.
Freecad file for easy modification included.
I printed with 2 outer layers, 15% infill and 0.2mm layerheight. No supports required. Other settings will probably work as well.
The author marked this model as their own original creation.