I needed a small 12V fan to cool an network device which has to live outside (in the heat of summer), and found a neat little controller on AliExpress (also on Amazon), which can operate a PWM (4-wire) PC fan based on temp set points. It is pretty simple to program, but I found the default settings work pretty well. The one I bought has a small temp probe which can be mounted using a screw, though for my application I just taped it to the device that was being cooled.
I made a simple 3D printed stand to hold the fan, a DC connector and the controller, which assembles with four M4x40mm FHCS and M4 locknuts. I added a pair of 2 port WAGO's to keep the wiring simple (no soldering). I haven't posted it yet, but when it is, I will update this post with a link.
I made a simple 3D printed stand to hold the fan, a DC connector and the controller, which assembles with four M4x40mm FHCS and M4 locknuts. I added a pair of 2 port WAGO's to keep the wiring simple (no soldering). I haven't posted it yet, but when it is, I will update this post with a link.
7/31/2026: I decided to add a dual fan version of this, which should work for larger routers. I still need to get these uploaded though.
8/6/2026: I had to shrink the dual fan version by 2mm to fit it on an X1/P1 size printer bed, but there is plenty of room so nothing was given up to do that. The current version is now uploaded to MakerWorld:
https://makerworld.com/en/models/3142511-temperature-controlled-12v-pc-cooling-stand#profileId-3548341
https://www.printables.com/model/1802241-temperature-controlled-12v-pc-cooling-stand
https://makerworld.com/en/models/3142511-temperature-controlled-12v-pc-cooling-stand#profileId-3548341
https://www.printables.com/model/1802241-temperature-controlled-12v-pc-cooling-stand
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