Cute. This is how I always explain the machines when I’m in a hurry.
“Put a hot glue gun on a CNC. Now make the nozzle really small. Now use plastic not glue. 3d printer.”
This is exactly how 3D printing got started in the first place. This isn’t just an old idea, it’s the oldest idea.
Yup, I made the first one from a glue gun and lots of Meccano.