modular portable workshop fan
thingiverse
This is specifically designed for 120 mm fans and a 9Ah scooter battery. I use M6 screws for the segments and M4 screws for the fans. You'll need that switch: https://www.amazon.com/dp/B00OQ01XR4/ref=twister_B07M9R7HBY/?th=1 If you're installing multiple fans, it's a good idea to get a second switch to handle the increased amperage.
Download Model from thingiverse
With this file you will be able to print modular portable workshop fan with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on modular portable workshop fan.