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If you use a current Cura (3.2.1) as slicer: try to disable combing mode ("off") and use a layer height of 0.2 mm. That produces better holes. 50 °C should be enough for the bed but that doesn't make a huge difference. Same settings for the screw.

Try to print the frame parts first and make sure they fit into the holes of the front plate. If they're not precise enough, I wouldn't start with the more demanding thread.

(a better photo might have helped to diagnose the problem)