I have two Clever Dripper coffee brewers that have both had one of the four feet on the brewer break off, making it too tippy to use. I've tried gluing on broken pieces but the This is a simple part that should slide tightly over the bottom and allow you to use the brewer again. I've printed in PETG and it seems to be working well.

I believe there used to be two sizes of Clever Dripper brewers, but they only list one on their website now, the 500mL version. This is for that size dripper with a ~105mm diameter base.