Sand Pole Base - a stackable base for supporting a pole in the sand

This is a 13cm wide base for seating poles 3cm or less diameter in sand. It has fins on the bottom to grip the sand better, and is stackable. Photos show the half-size prototypes, I'll update with full size prints later, and test results.

Edit - Snapped a V2 in half during a stormy night - V3 is stronger.