0.9mm separation should be ok shouldn't it.
bum! 0.9 sometime looks like 0.09 to me! that what happen to me when calculating while typing. 0.9mm should be very ok!.
i keep my limit to 0.31mm
Is that a copper separation distance of 0.31mm?
i guess separation means clearance? if so, yes.
But how much margin do you use around the copper for the solder mask? Any?
no or i'm not yet aware of how to specify that in diptrace. it automatically created for me
![Sad :(](https://www.eevblog.com/forum/Smileys/default/xsad.gif.pagespeed.ic.L3FGyzQrjB.png)
FWIW attached are my diptrace design rule setting last time i edited based on itead's rule (3rd pic), i hope i didnt miss something as i already sent my 1st board to them, hope it will not screwed, i also learning. i need to recheck those rules thouroughly again. if you set those rules in your eda, it should be able to warn you about this.