Ender 3d printing nylon filament

Start by replacing the Print head with an all metal hot end like the Micro-swiss

Then adjust the retraction settings in Cura to prevent strings in the print as follows:

Enable Retraction: Yes

Retraction Distance: Begin with a setting of 5 mm and adjust it up or down by 1 mm until all stringing is gone.

Retraction Speed: Begin with 50 mm/s and slow down if you are seeing filament damage.

Retraction Extra Prime Amount: Leave at 0

Maximum Retraction Count: Set to 10 and only adjust if you see filament damage.

Minimum Extrusion Distance Window: Set to your Retraction Distance

Nozzle Switch Retraction Distance: 16 mm

Nozzle Switch Retraction Speed: 20 mm/s 

Limit Support Retractions: Enable