infill not connecting to the outlines

[joergen 1]

If you happen that your infill isn't connecting to the outlines, and you have already set a reasonable overlap (in i.e. cura) to 15%, and your belts are already tight, check if your set screws on the XY stepper axis are properly tightened, especially if you have a D-shaped axis. if the set screw isn't perpendicular to the flat side, it will cause a tiny bit of backlash when the stepper changes direction. don't overtighten the setscrew, since it would damage the threading.

[tachyio 0]

Yes I do get this, which ones are the "set screws"?

After moving into my friend's office, the machine is experiencing daily "thermal cycling" from 14C during the day to 29C at night, which I believe is causing it's belts to loosen and the frame to distort very slightly - which is affecting the quality of prints.