Exhaust adapter for k40 laser - 80mm low profile

This is an exhaust adapter for k40 laser

driver for design:

• To be fully printable on the bed of Ender 3 (23x23 cm)
• 80 mm tube outlet size
• Compact, have to replace the original fan, using only the inner screws (an in line fan will be required)
• Optimize the tube position to reduce the space occupied in the rear of the laser.