Prusa mk4 board cooling

I have my printers in an enclosure as i print in a dusty enviroment. Not only does the enclosure keep the printers clean, it stops drafts and keeps the temperature stable. Problem with that is it can get a bit warm in there when printing something like PC or PA11.

To help combat this, I have 2, 40mm fans attached to the main board. One pulls air from outside the enclosure and blows it over the board. The other expels air from the board's case to outside the enclosure. This way there is very little effect on any prints as it doesn't cause any drafts.

I designed this with 42mm ducting in mind that I had at home and 40x40x10 fans. I have included a fan shroud so if you wanted to you could use 40x40x20 fans.

You will need 4 x m3x12 and 4 x m3x16 screws for your fans (I used noctura fans and the screws will sink in to the case from one side but not the other) and 1 x m3x6 to attach the fan shroud. The 4 screws that you remove to take the case lid off can be reused to put the new lid on.

If you use 20mm fans then you will need longer screws but you will have to check them as I dont have a 20mm fan.

When attaching your fans make sure to have one on push ond the other on pull otherwise it just wont work.

I have also attached another fan duct so that it could be used with the prusa enclosure as well. You will need to cut 2 x 40mm holes in the side (one for intake and one for exhaust) and then use the seperate fan ducts to attach to the case by screwing them on from the other side.

This will require another 8 x m3 screws (length depends on case thickness) and 8 x m3 nuts.

I printed this with PETG but it should work equally well with pla (keep an eye on temps though).