speed
For very good dimensional accuracy (corners not blobby) it's best to keep the speed low. For really beautiful parts you want to go no faster than around 25mm/sec regardless of layer height and nozzle size. This has to do with speed changes at corners. The printer has to slow down to 14mm/sec on a right angle corner so only slowing by about 2X is barely a problem but if you are at 50mm/sec or faster the corners are noticably bulging. This is regardless of nozzle size or layer height. That's why it's so great to print with a bigger nozzle instead of just printing faster.
temperature
You will get consistently better quality at lower printing temps but this means you also have to slow down as it's harder to get filament through the nozzle. For high quality 210-220C is a good compromise. For extra high quality print extra slow (10mm/sec?) and at 190C. That way the filament is more like cement and is better at not moving in the second before it cools. But really 220C is my favorite temperature. For the .8mm nozzle and larger it's best to print hotter as it is hard for the heat to penetrate to the center (unless you buy a 3dsolex race nozzle) and so ultimaker recommends printing a bit hotter with .8mm and larger nozzles.
https://www.youtube.com/watch?v=afLolx2OEKE
how to print bigger things
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