I got tired of driving the blunt tip of our beach umbrella into the sand so decided to design this as a better alternative. It fits any beach umbrella with a 23mm shaft diameter, but if you're good at math you can probably scale it to fit other shaft diameters as well.

Print it as oriented (pointy side up) and with at least 3mm wall width and top/bottom thickness and at least 50% infill for strength. No supports are needed. The prints shown were done in PETG.