MK4 electronics cooling and enclosure venting
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Cooling and ventilation of a PRUSA MK4 inside an enclosure using an old (or new) bathroon fan.
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I had an extra bathroom ventilation fan, so why not use it! This is my solution for cooling my MK4 electronics and, at the same time, venting the inside of the enclosure.
The enclosure I have has a side panel that opens and it is the perfect size for the bathroom fan. I hooked up a basic dimmer switch to attenuate the fan speed. When the fan is on and the enclosure is closed, it creates a vaccum inside the enclosure drawing ambient room air from the vent at the top of the enclosure. This cooler ambient air is drawn through ducting directly to the PSU and Buddy Box via 31mm tubing which I bought at HomeDepot.
With this design, the original PSU face plate and Buddy Box face plate are replaced with parts included here. M3x10 screws are used for attaching the faceplates to the electronics boxes. There are 5mm temperature sensor probe holes on both the PSU and Buddy Box faceplates. These are for inserting a temp probe into each box to monitor the internal temperature. Please be sure to cover the metal temperature probe with electrical tape to prevent shorting the electronics before you take readings from inside the PSU or Buddy Box
In my experience, depending on the fan speed chosen, the temperature inside the PSU and Buddy Box is 5 to 19 degrees cooler than with no ventilation inside the enclosure. If I am able to keep the temperature inside each electronics box to 25 - 30 degrees celcius, I am comfortable with the result. I have my printer in an cool, unfinished basement so this result is completely attainable. ABS and ASA print much easier with this system but for large models occasionally bed adhesion is a problem. I think this is because my enclosure is made from uninsulated fabric and there must be temperature differentials inside the enclosure. But these materials are more difficult to print anyway.
After the cool air is drawn into each electronics box, VOC’s and enclosure air are it are drawn out of the printer enclosure and vented to the outside the house via standard ducting and a dryer vent.
UPDATE July 5th 2024
I've added a couple of new files for the intake. They are smaller and don't take up as much space in the enclosure.