Due to mine not working any more, and not finding one I liked here. I came up with this simple print. No support needed. Print with the handle portion flat on the bed. I added rubber around the inner part and pushed it flush with the outer ring. I cut it from an old bicycle tube. Other ideas you could use maybe: rubber cement may work a little, you could cut some wax paper and out it down in the tub and shoot some hot glue on the part and push it down. It would stick to the wax paper so you could remove the paper after it cools and it should be a decent seal, If you have gasket material or silicone you could do the same.