1) retraction
Sorry I don't use nf, only Cura. Lower temps helps but you need retraction on the UM because of the bowden tube. 4.5mm retraction is about right. Cura has this on by default but you have to set the minimum travel distance to enable retraction in Cura.
2) small/fast layers
Regarding smaller objects/layers not coming out as nice - you need to slow down the machine and crank the fan. Usually 5 seconds per layer is enough for it to cool. If it doesn't cool enough the next layer looks worse and the layer above that even worse until a cube is turning into a warped ellipse (the corners are particularly melted looking).
Cura again has a wonderful setting: "minimal layer cool time" which defaults to 7 seconds. It slows down the speed (mm/sec) for each layer so that if it would have taken less than 7 seconds it sets the correct speed so it takes exactly 7 seconds.
Alternatively if you have an ulticontroller you can slow down the layers manually when you get near the top of your print. Remember - no faster than 5 seconds per layer. And make sure the fan is on for these fast layers.
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illuminarti 18
I don't know much about netfabb, but you will want to make sure that you have retraction enabled; I seem to recall that for a long time netfabb didn't do retraction and/or didn't do it right. Are you fully up-to-date with the latest version?
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