Marbulous, Marble Genius, Marble Run, Toto Toys Standard
Post 35mm h x 27.5mm dia, Boss 6mm h x 23.5mm dia
Posts 100mm between center, 17.5mm I.D. tube, 4deg slope

This model has 2 posts and measures 1 post high.

I set the support overhang angle at 60deg to provide support for only the post undersides.
Set support for only touching buildplate.

The rib was added to provide more rigidity and to reduce support needed.