Duet 3 Cooling Fan Location

mwolter

Designing a case for the Duet 3 and wondering if it's recommended to cool the top or bottom of the board? Most of the Duet 2 boards have a fan cooling the underside of the drivers. Is this recommended or should the fan be directed towards the top of the board to cool the CPU and mosfets?

Thanks in advance!

jens55

Cool the bottom!
Mount the board vertical as well to get some thermal convection going.

jens55

https://duet3d.dozuki.com/Wiki/Mounting_and_cooling_the_board

garyd9

@jens55 said in Duet 3 Cooling Fan Location:

https://duet3d.dozuki.com/Wiki/Mounting_and_cooling_the_board

Unfortunately, the "mounting" and "cooling" sections of that wiki page address the Duet Wifi, Ethernet and Maestro, but not the 3...

mwolter

Thanks @jens55 but as @garyd9 mentioned, that post doesn't specify cooling recommendations for the Duet 3. The stepper design is different than the previous boards and it might not be necessary to cool the underside.

jens55

I am sure that you will hear from the designer shortly ....

deckingman

If it helps, I installed a fan to blow air onto the back of the gen 3 board but even when moving my 3kgs plus at high speeds using Nema 23s set to 2.2Amps, none of the driver chips nor the MCU get above luke warm without the fan running. So I've removed the fan as it's completely unnecessary.

dc42

Preferably use a fan to blow air along the lines of output mosfets on both sides of the PCB. But unless you are using more than about 3A peak current or a high current bed heater, you probably don't need fan cooling at all.