I've been trying to print some M14 female threads. The male threads I've printed were perfect and fit into a female metal nut, but for some reason I cannot get the female threads to "stick". This means that they end up being hard to screw into, or the male end (both metal and my printed versions) goes in wonky.
I'm printing in PLA on an Ender 3 V2 at 200 °C on a 50 °C bed. I've tried various resolutions (down to 0.1 mm layer height) and they all exhibit the issue. Print speed is 50 mm/s, cooling is just the stock cooling and fan 100 % after the first layer.
The actual file can be found here (note that it's slightly oversized vs a metric M14 female to allow for printer tolerances) and the follow image shows what I'm talking about:
It's as though the nozzle is pulling the filament away from the wall, but I've tried Z Hop Retraction and combing (infill only) and that gives the same result.
Answer: The accepted answer and the comments against the question pointed me in the right direction. A combination of turning off combing and reducing the hot end temp to 190°C gave me perfect threads in 3 consecutive prints.