fs-ulx3s/doc/board-production-rules.txt

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217 B

oshpark
The minimum specs for 4 layer orders are
5 mil (0.127 mm) traces with 5 mil (0.127 mm) spacing,
and 10 mil (0.254 mm) drills with 4 mil (0.1 mm) annular rings.
seeedstudio
minimum drill hole: 0.2 mm width