[visualops]

I can see that. I suppose the similarities are there, but a machine that extrudes material isn’t printing.
Watching a 3d printer in action actually reminded me of how I used to build sandcastles by dripping wet sand to make towers.

[JRandomFreeper]

but a machine that extrudes material isn’t printing.

Your InkJet(tm) printer extrudes ink onto a substrate of paper. Sounds like a machine extruding material to me.

/johnny