In article
,
harry wrote:

Never seen it because it don't exist.

Attempting to save face by stubbornly clinging to your ignorance is
usually counterproductive. My ego takes a boot to the ass every time I
stand corrected, but it's better than the alternative.

What exactly to you find so preposterous? That machines exist which can
deposit thin layers of material, one atop the other, until a solid
object is created? That hardly violates any junior high school physics
principle.