0.25, 0.3 and 0.4mm layer heigh for 0.6mm nozzle  

Re: 0.25, 0.3 and 0.4mm layer heigh for 0.6mm nozzle

Yes. I have printed with up to 0.80mm nozzles. I find 0.60mm to be about the largest practical size. You can print layers up to 80% of nozzle bore reliably. Speeds will be slower, but you can lay down plastic much more quickly.

With a 0.60mm nozzle, very little changes. The small details you can print will be limited, but the larger extrusion width will speed up a lot of things. Watching the lines go down is very satisfying. They look robust immediately. As you increase layer height (up to 0.48mm with a 0.60mm nozzle), things take on a very distinctive "3D printed" look, but I quite like it for functional parts. The key is that you need to slow your speeds down. The E3D V6 extruder can only process so much material in a given time.

At 0.80, you can print really large, chunky things, but loss of detail is apparent. Corners are very rounded. It's not a very practical size IMO, though as the article and video point out, it's great for toys. Here are example Benchys printed with the 0.80mm nozzle at 0.48mm (left) and 0.64mm (right) layer heights:

I haven't made any attempt to tune these, I just wanted to see what the layers looked like. Appearance could definitely be tuned. I'll update with 0.60mm nozzle examples when I get a chance.

Going the other way, 0.25mm nozzles are great for where you want more detail. Things will be incredibly slow at the reduced layer heights, but the printer can pick out small details that are impossible with a larger nozzle. Here's the same model, printed with a 0.40mm nozzle (top) and 0.25mm nozzle (bottom) both at 0.10mm layer heights:

Notice the increased detail around the wheels, particularly the bolts on the front sprocket. I tried to slice the same model with the 0.60mm nozzle without success. Note the missing spokes and tread gaps.