I hope I worded that right.
I sought a universal way to quiet and control the electronics fans for my 3D printers. What I found are inexpensive, easy to install and can be used between all my machines. I can use up to 12V (24V with a buck converter) and up to .9A of fans.
The controller can be found on Aliexpress here and here from the same company I used, or try a search for "DC 5V 12V PWM Speed Controller Fan Speed governor" or look for something that looks the same with the same specifications. But, if you buy something slightly different, it may not fit into the skid on my Thingiverse page.
The controller snaps into part "B11 MPSM Ele Fan Control Skid", or the one with mounting holes. They're designed to be filed down on the inside for custom mounting tension. Place it where you can get to it for adjustment while printing .
Use a multitap to connect it to incoming power. I used standard DuPont connectors to connect to the existing fan connectors. The programming instructions are insane, so I generously included some that are slightly less cryptic. Download the file, "fans_controllers_instructions.pdf". I set mine to "2, 2, and 2" because it seemed good reasonable, YMMV.