SMB pads were way too big!
crystal oscillator needs a bigger footprint
big transient supression diode is too close to filter.
filter is really close to PLB connector
PLB footprint may be a little off-check it
change cap values for stepper caps.
fix rc filters
put minus signs on tant caps
change 3.3 uF caps to 3.3nF
fix hole spacing for mounting holes
try to make the spacing of the traces further apart
put a bias resistor on the pots for the steppers
use 10 pin connector
use a digital out and "and" it with the reverse signal
 --turns out you need 4 NAND gates to do it right
 --PWMout =     PWMin & (~DIR + LIMIT2)
 --PWMout = ~(~(PWMin & ~(DIR & ~LIMIT2)))
 --pull LIMIT2 down to GND with 10K resistor