vertical spacers, gravitrax compatible

Vertical spacers which are compatible with gravitrax. There if a full wall version or walls with holes (hole in the bottom side too). And it is printable without supports.
Printable direct from STL file or customizable in openscad file.
Customization typically can change the height. For edit use of primary spacers-X-Y.scad.
Each part must have ring.stl glued on the bottom side.