I tried others design out there but cannot make it work for a 40mm of 11mm/16mm of thickness.
So after wasting PLA, I decided to make one that work with 40mm fan with thickness of max 16mm.
The bottom have m3 holes in a grid layout of 10mm between each holes. Should work fine for any design out there...
This thing come with 3 STL, one for the COVER, the 2 others are the enclosure for HOT BED and HOT END. The only difference between these 2 are the name on the box :).
I put the fan in outtake mode, so the hot air are suck outside, at the same time new air are coming from the vent holes.
Hope you like it.
In the image from my print I used 0.3mm layer height but it's too big because the ventilation holes are 2mm in height and the size is a little bit different on the print because it is a multiple of 0.3...
So use at least 0.2 or lower for a better print! Please note I printed at 100mms so I could have a better print if I was going slower :).
Also the print I have done is a little different (now the ENCLOSURE as been removed)...