since a long time I am reading in this very helpful forum but now I have to ask for tips and solutions aswell.
My inner holes are only poorly connected to the other layers. This happens only to horizontal holes, walls are not affected aswell.
At the beginning I had a lot of retraction problems (not enough filament after retraction, 100% filament flow only after some cm) and had to change the retraction distance to only 0.3mm. Not the beginning after traveling is uncomplicated... but the holes still have probelms.
My setup: Cura 3.0.4 and a Anycubic Prusa i3