I got tired of my lightweight styrofoam tombstone decorations flying around the yard in the October winds, so I created these braces to fit into the bottom of the tombstone and bury into the ground. You'll still need some dirt or mulch to pack around the base, but it holds better than just burying it.
This was printed on the Ender 3 Pro and sliced with the following settings:
The author hasn't provided the model origin yet.