Customizable Plant Stand

Print upside-down
no supports needed

You can kinda customize the scad file but make sure to make the 'side_length' a multiple of 'thickness'.
Play around with params for the feet as you may have to adjust those in order to not look crappy with some combinations of parameters.

Here's another square version with less material in it and a round one:
https://www.thingiverse.com/thing:6677940
https://www.thingiverse.com/thing:6677946