Hi there. My printer used to print things near perfectly. (Anet A6). There were vertical lines, but I seem to have fixed that. The problem is, there’s gaps at random spots, or layers that aren’t connected. I’ve tried re-levelling my bed, multiple times, tightening screws, tightening X and Y axis, lubing up Z axis, using printer menu to configure x-y-z jerk and testing things in cura. I’ve tried everything I can think of and it doesn’t work.
