Anycubic I3 Mega S High-Speed Fan Duct

Edit 2020-01-15: I accidentally uploaded the wrong file for part 3. I am really sorry everyone. I corrected the mistake.

A substantial remix of Domi1988's work.

Changes I have made:

• Increased height adjustability
• Improved airflow for fast printing! Especially suitable for powerful 5015 radial fans. Air is directed at a very broad region below the nozzle, greatly increasing the time the hot plastic is exposed to the part cooling fan.
• Improved fit of part 1