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BackFiles 7e24b3de83 Notes from MK's PCB livestream - avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals PCB layout: [front](Docs/precadsr_layout_front.pdf), [back](Docs/precadsr_layout_back.pdf) .
- Normal 9.964592e-01 8.406732e-02 1.348105e-03 vertex -1.045318e+02 9.809589e+01 1.855000e+01.
- -5.88471 -1.17054 6.59 facet normal.