I had a 4028 fan that came with the rat rig running well on a BTT Octopus 1.1 with I guess standard configuration, red and black going to 12V always on and blue going to fan_controller_pin...worked well for a while, but I was just careless and fried it. Ordered this one. When I have the red and the black plugged in it runs at 100% all the time, but when I plug the PWN in it turns off.
Fan seems to work well, just plugging in the PWN kills it, but when I unplug it it turns back on. Tried it on another printer (same board and setup) and same thing. I'm wondering if it might be cycle_time, but I I haven't been able to figure out how to calculate that.