And those errors can be hard to identify. Making PCBs is tricky and for each increment of tolerance you remove you increase the chances that the PCB (proto or not) will be fabricated with an error. Why design in 10mil trace/space when a fab house allows 8mil or smaller for the same price? You shouldn't need to go that small on your first board. We go smaller than this on many designs but if you're designing your first PCB, do not design it with 4mil traces and 8mil vias.
In general, SparkFun designs boards with: Let's take a moment to talk trace width, trace spacing, and vias. Re-open the DRC window and you can now change the settings using imperial units. This will change all the units to inches. On the left tool menu of the PCB layout window, click on the 'in' button.
If you'd prefer to see the settings in inches, close this window. Note: All the DRC settings are in millimeters.
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