Red is positive, black is negative. As far as I can tell there’s not a strict standard for how fan polarity has to be in the connector. I have fans of all different kinds with a variety of each.
You can look at the silkscreen printed on the fan connector and verify which one is +. On mine at least, the fan wires had to be switched. It was obvious when holding the old and new fan connectors together. Something like this:
Received my Snapmaker last week and after the first power up I was suprised how ridiculously loud the PSU is. Also designed (yet another) fan bracket for the exhaust fan without the need of modificating the back plate. Thought I might share with you::
Also made a short video for comparison of the stock fan to a Noctua fan if someone who hasn’t received the Snapmaker is wondering what everybody is talking about…
After silencing the exhaust the PSU wasn’t as quiet as expected so I took a closer look at the power supply. Installed is a 350W “Great Wall” PSU, the venting holes made quite some whistling noise.
First i thought of printing a new cover but since it is a low profile PSU without much room to the top of the enclosure I wouldn’t be very comfortable with a (thermo)plastic cover so close to heat sources.
So instead I removed this venting hole part completely and sanded the edges down.
I don’t mind it that much either. But I must say it’s tucked away safely in the basement where it isn’t that critical. I wouldn’t want it my living room
Currently I’m doing some cnc work and with the noise generated by the milling bit cutting through the mdf + the sound of the vacuum for dust collection, I don’t even hear the power supply anymore (or the stepper drivers for that matter)
Just swapped the fan out now for the recommended one from Aliexpress, gosh what a difference it makes in noise level. I can stand to be in the same room now.
Hardest part was fiddling with the wires in the plug. Just as well the order comes with 2 fans as I somehow wrecked the metal in the first one, but no problem in the 2nd one.