[WillAdams]

_If_ one is using a firmware which supports that.

Grbl, which many of the 3D printer firmwares are based on, does not (and no variables, or loops, or branching).

[myself248]

And weirdly, neither does Klipper, despite having all the resources in the world to do so. Just not a priority since slicers don't produce code like that, and 99.999% of Klipper's job is to eat whatever a slicer sends it.

So suppose I attached an extruder to a Haas mill or something...