16.1mm diameter bar legs. Raises the bottom of the stool up to bumper height of your Roomba. Requires a 9/16 hole to be drilled into the base, so it doesn't move or rotate. I added some epoxy as well, just as a bonus. You can break off the peg if you don't want to drill into the bar. Scale to your size bar but remember you will also be scaling the peg. Drill accordingly.

PLA (or whatever you want to use), 60% Gyroid infill, 4 walls. 100% infill not recommended.