I have:
Error during print. 馃枿!
Basically ! to the existing printer-3d icon.

Does this look right?
IMO, this is way too complex. What if the cube was replaced with an alert? When it comes to UI, it could be recognizable

Weird without the cube. Might work in context.
Was thinking since we have printer-error it might be a good idea to have an error for a 3D print. The nozzle alert is more for jam/temperature issue.
I think nozzle alert does better for 3d printers. Closing this out.