Starfleet's trusty cartoon medical scanner. Solid version and 'hollow' version with as much space as I could make inside with small channels for wiring so buttons can be lighted.
Scanner can be held into body with 2x 12-13mm round magnets, 3mm thick.
Main upper body section can be mirrored if you want the scanner mounted the opposite way around.
Screen image file included.
STL (Stereolithography, filesize: 20.6 MB), JPG (JPG, filesize: 20.6 MB)