Quality is a bit of an open term.
what are you trying to accomplish.
3d printing is a balance of many things
layer height generally smaller layers make for a smoother print abs can be vapor polished to further improve finish.
other quality issues include :
Dimensional accuracy
Bridging performance
Overhang performance
Negative space performance
Fine positive space performance
resonance
More info here.
http://makezine.com/2014/11/07/how-to-e … st-probes/
the type of print you are making will effect your strategy and settings.
also pla almost needs a cooing fan although I have made some nice prints without it.
I generally go for a gooey hot full first layer or two then lower the heat and increase speed for normal layers.
15 -20% infill is usually plenty for most work. extra perimeters add strength.
and for flat top pieces I again slow down the speed and push the filament flow for the top two or three layers.
slicer will actually allow you to vary layer height. so on a curved surface like an animal you can make finer layers on the curves to improve surface texture / finish.
It takes time to learn what setting effect what quality points. I encourage you to try some if not all of the test prints mentioned in the above link. and share the results. then we can help with one quality issue at a time. also if you post pics of you prints we can help.
Tin
Soliddoodle 4 stock w glass bed------Folger Tech Prusa 2020 upgraded to and titan /aero extruder mirror bed
FT5 with titan/ E3D Aero------MP mini select w glass bed
MP Utimate maker pro-W bondtech extruder
Marlin/Repetier Host/ Slic3r and Cura