The iPhone bump has increased over time and cases typically include a raised protective ring.  Both keep the phones from laying flat, negating the level measurement function of apps.  This model uses three 12mm x 3mm round magnets to attach to iPhones 12 and newer.  When installed, the disk provides a flat surface that will clear the camera bump/case ring and allow for level apps to function properly.  A magnet fit check model is included to allow for users to more quickly check their magnet fit-up before printing the level disk. Magnets should be flush with the top surface, with a press fit.  Each magnet location has a hole to allow for the magnets to be pushed out once installed.  Fusion 360 file included.