After printing the Mac model, I inserted an Arduino Nano inside and programmed it to display messages.
I used https://www.thingiverse.com/thing:2336955 to print a "sled" for the Arduino and glued it inside the Mac body. Maybe next time I will simply add that part into the Mac model itself...
The small diskettes are copies of https://www.thingiverse.com/thing:1614896 that I scaled down to the size of the slot in the Mac. I found that Sharpie makes "oil-based paint" markers in various colors, and used silver for the cover. The diskette labels were printed on (wait for it...) some old diskette labels I still had in my miscellaneous paper drawer!
The second video shows what my 3D prints do when I'm not around... ;)