Temi robot tray

Early this year, I made an early-bird purchase of a temi robot (https://www.robotemi.com/) and got it a month or so ago. It's lots of fun and I realized that the flat tray on the back (with wireless charging pad) isn't great for holding anything cylindrical while being transported around the house (e.g., to my spouse in another room), so I made this tray to hold such things so they don't roll off during the ride.