Risers for anything with casters

Do bear in mind that how strong they are is a result of your own slicing, I found they work OK for a portable air con at I think about 25% infill, but a portable air con isn't too heavy. 

Probably not suitable for chairs or anything that people are gonna be pushing around, they don't move and aren't really suited to keeping anything still that people want to move. 

In the end they taper out pretty wide, because it helps stop the thing pushing them over.