This is a flag pole holder, a design I tinkered from lzejikwups. (https://www.thingiverse.com/thing:2962598) I didn't want to deal with where to put the cap when the pole was in place, so I carved out a concave channel in the base for any water to drain out.

It has four screw holes and designed to hold a 1" diameter flag pole.

I printed the holder in ABS with 0.2mm layer height, 50% infill, 4 perimeter shells, and 5 top and bottom solid layers.