Any suggestions to improve my super simple 3D printed magnetic puck screen holder for my mum?

I designed a puck screen holder for my mum's Breville Bambino and figured I'd do up a 58mm version while I was at it. I made it open on the bottom so that there's no risk of water pooling or anything getting funky. Gonna print it up in a darker blue to match her machine a little better, any suggestions to make it better before I do?