A 3D printer (n.) is patience converted into objects one thin layer at a time.
A 3D printer (n.) is a glue gun that read the blueprints.
A 3D printer (n.) becomes the hobby, and the objects it makes are mostly evidence that it works.
A 3D printer (n.) is a bad business investment since people can just buy themselves one, then print themselves a 3D printer, and then return the one they bought.
An Adding machine (n.) is arithmetic that used to click instead of glow.
An Adding machine (n.) is a clerk who never asks what the numbers are for.
An Adding machine (n.) makes a noise for every number so the room can hear work being done.
An Adding machine (n.) prints a paper tape that gets thrown out unread, and that tape is why anyone believes the total.
An Airplane (n.) is the only place where you cannot walk out on a dull movie.
Airplane (n.) is an unfortunate invention that did away with distant relatives.
The Airplane (n.) is a modern vehicle invented to make the world smaller.
The Airplane (n.) is responsible for bring two places closer together - this world and the next.
An Appliance (n.) is bought once, ignored for a decade, and then becomes the most urgent thing in the house