These are actually the corner pillars from my first keepsake box upload, with enhanced bases.
They are solid pedestals, not containers.
I have uploaded two sizes, even though any slicer could easily scale these to any size.
They print with no supports, but I am about to give up the struggle with sharp corners that don't seem to stay on my print bed, no matter how good my bed adhesion seems to be.
Therefore, you can expect my uploads to have rounded corners on their bases in the future, since these tend to stay on the bed surface with no trouble.
Amazon Basics ABS
More sharp corners at the base, more trouble with lifting corners unless bed adhesion is very tight.
All but one corner of my test prints stayed on the bed.