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I have been using 32 as a trace size after good advice from madbean.

I wonder though, it does seem small compared to some commercial sized traces? Do I gain or lose anything by going to 40 lets say? It seems it might be easier for me at least when I uv transfer and etch.

More or less thinking out loud here.

Happy thanksgiving (day early)

In many manufactured boards, it's pretty common to see a trace width of 16. Much easier to get away with that when a machine is doing it. I don't think you gain anything by going up to 40...I usually do 24 for everything. However, I remember reading somewhere that having your power rails larger (9v, Vb) brings some advantage, although I don't remember why.

Coolness.

impedance

...and coolness, yeah