K40 Air Duct

This is a replacement air duct for the typical Chinese K40 laser cutter machines that can be used with standard 100mm tubes.

Some padding / sealing might be appropriate depending on the exact dimensions of the brackets at the back of your machine.

I've included the original Fusion 360 design file as well as an STL for the complete air duct. But it was too big to print easily on my Prusa i3 MK3 so I also included files for a version where I cut the air duct into 3 parts that were easier to print and then glued them together. (I wasn't looking to win any beauty prizes with the end result).