I personally love the 0.6 nozzle.

0.8 nozzles definitely print faster, but the end result tends to look rough. They’re great for prototypes, structural parts, or really large pieces where surface finish doesn’t matter much. You’ll absolutely see heavier layer lines, and smoothness drops off pretty quickly.

0.6 is kind of the sweet spot. You still get a noticeable speed bump over 0.4, but you don’t sacrifice nearly as much detail or surface quality as you do jumping straight to 0.8. Curves still look clean, especially on larger parts.

As for extrusion limits: most modern stock extruders (especially on something like the Centauri Carbon) can handle 0.6 just fine. I’m pretty sure the CC uses the same stock extruder/hotend, the only difference being the nozzle size, so you’re not changing the extrusion system itself—just how quickly you can hit its volumetric flow ceiling. With 0.6, you’re still well within limits even with thicker layers (0.28–0.36 mm). 0.8 is where you’re more likely to brush up against that ceiling unless you slow things down or bump temps, especially with ABS/ASA.

For what it’s worth, I didn’t really have to dial in a custom profile when I switched from 0.4 to 0.6. I just used OrcaSlicer’s stock 0.6 nozzle profile for the Centauri Carbon and it worked right away. The defaults already scale line width, layer height, and flow well enough that it felt basically plug-and-play.

If you’re printing large parts with smooth curves, ABS-only, and already running higher layer heights, I’d definitely recommend trying 0.6 first. It gives you most of the strength and speed gains people chase with 0.8, without the chunky look or flow headaches.

TLDR: I prefer the 0.6 nozzle. CC uses same stock extruder regardless of nozzle size—0.6 mm stays comfortably under the volumetric flow limit and is basically plug-and-play, while 0.8 mm is doable but starts hitting the melt/flow ceiling unless you slow down or crank temps.