increase clearance for PCB connector pins (slot width)
remove spool tab interference (kerf value isn't accurate enough anyway, and undersizing requires labor-intensive filing/sanding whereas oversizing just requires a little glue)
shrink spool axle M4 hole to get less spool "sag" due to unnecessary clearance
decrease interference on magnet hole (again, an undersized hole is labor intensive to fix whereas oversized just requires a dot of glue in the worst case)
add Elecrow acrylic kerf value that has been tested