Massager — Version 2. Snap-on Top

Hello. I made this in fusion 360. I printed many versions before choosing this one. I had trouble with the tabs snapping when snapping the top on. I revised it several ways. the last 3 have not snapped. Be sure to push in carefully. Push straight in and even pressure on both sides. If it should break you can just glue the top in. Or print just the top again. I dont think you should have a problem though. I used this on my arm muscles and it felt great. Plus you can just roll it in your hand. My drawing screenshot is included. thank you. UPDATE!!!. Version 2 has bigger smoother knobs on it. Made by request. I like them both.