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Maybe different step-down modules lead to different results. My fans are starting to spin at 50% ..
I dont know how you get a negative readout, maybe your are measuring at the wrong spots or are grounding something.Yes, they do spin at 6V, I would suggest to set your part cooling to 0% - 50% - 75% - 100% for the first few layers
Took some measurements with infrared at the top of the hotend cooler110°C at the bottom on the hotend side30°C at the topSo it seems to be fine
The cover I linked has a bigger intake and is by far less restrictive. In my testing, the amount of moved air was alot higher
Ender 3 - Silent Fan Replacement GuideView Instructable »