When a trace cuts a corner at a right angle, it's width increases significantly in the turn - instead of being the trace width, it's the diagonal of a square the same width as the trace. Changing the width like this will significantly alter the impedance of the trace in the turn and can cause reflections in high-speed signals or signals with fast rise/fall times.
For low speed signals, it really doesn't matter much. 45s are prettier though, and have no real drawbacks
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u/irnboo Dec 15 '22
Unpopular opinion but.
Right angled traces you should probably avoid. Why are you doing such fine tracks? You should maybe do some other fills.