I have a bunch of painters pyramids, but I wanted something to be stable on a bench.

I've created a painters “pyramid” cone, which can be used in conjuction with a bench holes

The bench dog part is 20mm long which is sufficent for most benches.

I printed this with 2 perimeters and a 15% lightning infill and it was sturdy enough to hold up the project.

I recommend enabling brim to print it upright with no supports.