Highest resolution on Phenom

I’m getting too many horizontal lines on flat surfaces on my Phenom. I’ve been using the stock settings. I don’t mind it taking longer, currently I’m at 0.05mm height. Can I go tighter?

Also, I’m getting some vertical lines, so between the two, I have a faint 1/4" grid going on. Anything that can be done with this?

In a perfect world, I’m printing a flat 15" tall area, 12" wide and 1/2" thick that has map info on the flat side. No undulating surfaces (which I’ve done, and look great). But on large flat areas, I’m getting the faint grid.

do you gave some pictures? the layer lines is likely due to peel force and less to do with layer height. how do you orient your prints