Remixed with a bit more strength and does not need supports the fan aperture is totally enclosed and a little bit of clearance for the fan . Vents added in the back of the main box. The files with fan in the title have a bit more clearance for the fan. Added a fan cover and made the lid and body clip together. This was to make it easier to assemble the pi into it. And finally i added the diamond mesh to the body , it looked neater when it was printed . The clip together version with diamond mesh seem to work best for me.

Final edit . uploaded two files only with slight dimension changes to allow for a slightly longer hat.