[Retraction issue at layer change]

A lot of my cylindrical objects are having this issue (not my picture but similar) and on a facebook group someone posted the following regarding it:

 

Quote

This is, in fact, from retraction. Specifically, the retraction that happens either during the change between perimeters, or during the change from infill perimeters, or between layers. Any one of them could be the culprit.
What's happening is that--even though you're retracting--a small amount of filament is still oozing out before the retraction completes, and therefore it takes a second or two for the hotend to build pressure up again before extruding normally.
My suggestions are:
1. Turn your nozzle temp down. 5° may be able to cure it.
2. Increase your retraction *speed*, to reduce the amount of time available for ooze.
3. Introduce some extra restart distance. There should be a setting in whatever slicer you use that will allow you to prime the nozzle ever so slightly after every retract, in order to compensate for the ooze.

Was looking to confirm the issue is retraction and not something else, and for some advice regarding best practices to minimize this characteristic. I generally print at .2 or .1 layer heights, and the adhesion seems weaker at anything larger (to the point where the layers just crumble).  This is with multiple PLA brands and colors.  In general the print looks outstanding otherwise.


Regards
 

[Variable Layer Height Plugin]

Is there a plugin allowing me to change the layer height at a particular layer?  Especially for large prints, for the bulk of it a 0.2 layer height works great to reduce print time, but suffers on curves, domes, and so on especially near the top of prints, so it would be nice to be able to switch to a finer layer height (like 0.1) for these areas.  Or perhaps an adaptive layer height that will automatically switch to a finer layer once the print reaches certain angles  (max / min layer height bounds and angle defined by user).

Regards