Nylon should be printed at slow speed in a temperature maintained environment. i.e. cooling fan set to minimal or off. Below are the suggested printer settings.
Printing Temperature: 250C +/- accordingly
Heated Bed: 80C +/- accordingly
Printing speed: 30-50mm/s (slow)
Cooling fan: off
Please store unused Nylon filament in bag with dessicant to avoid moisture. Oven dry at 160F for 6-8 hours may be needed if the filament has been opened for a quite a while.