lol yeah, that's not that far off the aperture the concrete printing machines use.

Shame no new videos on their youtube page.
I'd like to see what they are using for print area cooling.


Speaking of nozzle sizes - try a 0.5.
I've yet to find any detailed stuff I can't print with mine. and it speeds prints up by 20% as well as letting you use 0.4mm layer heights.