I needed to raise my Ikea tables about an inch (26 mm), which was at the maximum extension of the screw-in feet, leaving the tables extremely unstable. So I created this simple riser to cup the feet. 

Because this is a practical print that will take some weight, I printed with 4 walls and 25% gyroid infill. After a couple of weeks, they are still holding up nicely for me. 

The cups fit the legs fairly close. There is about 2 mm of wiggle room.