Modified nozzle duct

MODIFIED:
1) Thicker screw spacer so it doesnt bend fan when screwed
2) Added fourth wall which slides into the fan
3) modified "support" for easier breaking

Print it without support, g.code is at 200c and 50mm print speed, use it on ender 3 without problem for PLA.

P.S. design around nozzle is top notch, among best ones I have seen, good job creator!