40mm fan
thingiverse
Here is a 40mm x 40mm x 10mm fan so you can design you own you own fan attachments
Download Model from thingiverse
With this file you will be able to print 40mm 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 40mm fan.