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Note the lines you see on the turret
are not 'print lines'. The lines on the track guard
are print lines (diagonal)
The lines ont he turret roof are a result of aliasing.
This is a digital layering process: the printer uses an LCD to turn on and off 3d pixels of resin. if there is a gradual slope it has to digitise that.
Imagine going up stairs with a fixed step height (layer height) and fixed step width (Pixel size).
Assuming step height and width are the same then at 45 degrees the steps are evenly spaced.
If its 60 degrees every now and then you have to add an extra step in to 'catch up'. These catch up steps result in additional step lines you can see.
Sounds bad... but remember we are actually talking VERY small steps.
The layer height used on my printer is usually 0.05mm and the LCD pixel size is 0.047x0.047mm for reference a human hair is on average 0.08-0.1mm
The printer will actually print down to 0.01mm but it's far easier for me just to sand the surface very slightly as 0.01mm means prints take 5x longer and the super fine layers plus extended print time means print failures are more common. For example at 0.05mm one track takes 11 hours already.
One layer of undercoat and they vanish anyway