First layer outline doesn't stick well when making a curve
I have trouble with the first layer sticking when making a curve or circle. A curve looks like a polygon. The in-fill for the rest of the first layer adheres fine and the entire print adheres at the end of the run. I've tried cleaning (alcohol, acetone), slowing speed to 65% (helps some), and adjusting Live Z (doesn't seem to help much). Any other suggestions to try? I have a MK2S printer and the original bed/surface that is in excellent condition. Thanks.
Your 1st layer Live-Z setting is way too high by the look of it. If you have not already done so, try using Jeff Jordan's "Life Adjust" procedure for calibrating your Live-Z setting. It is much easier to use and understand than the on-board routine and much easier to make mid-print adjustments accurately with. In general, start high (less negative) and work lower (more negative) in large increments (e.g. 0.1mm) until the filament starts to stick on its own. When you've got your Live-Z setting adjusted properly, you should be able to gently rub the extruded lines on the PEI surface without dislodging them. Then start lowering (more negative) the level until there are no gaps between layers. You should not be able to peel the lines apart after printing, but the top should be regular.
Thank you so much, that worked! I made a special model with circles that was one layer thick (0.2mm) and ran it at 100% speed. I ended up lowering Live Z by 0.2mm from where it was and it printed the curves great and the entire print stuck to the bed just fine at a 60 deg temp. I do clean the bed with alcohol before each run. Thanks for your advice, saved me a lot of precious time.