This is a customizable furniture riser block I made.

There are a few others on thingiverse, but they have sharp corners that I wanted to avoid for aesthetic reasons, and to avoid curling on the print bed.

I needed this part to keep my wooded furniture off the cement floor, and also allows my Neato vacuum to fit under my dresser nicely.

Put the dimensions of your furniture foot in for the top dimensions.
For the bottom dimensions, I've had good luck using the top dimensions and adding 10 mm.

I used 40% infill, and that worked well.