F. George McDuffee fired this volley
in :

The technology is developing rapidly, and the 3 axis
orthogonal consumer machines are now being challenged by the
delta machines.

The thing that gets missed often is that in 'industrial duty', the
machines (including delta types) capable of handling a wide range of
resins on one machine were available as production units as long ago as
1989. I have a cohort in military weapons development who's had one that
long.

The 'fad' part (and consumer part) just caught on, but it's already a
mature(ing) technology. It won't replace a whole bunch of methods;
rather, it adds one more to the stack of capabilities.

Lloyd