Ultimaker S5 Stepper Fans

i want to cool the steppers a bit so i made these shrouds to either screw in or double sided tape on. They have a 40mm x 40mm mounting pattern for the fan.

I use two USB fans i got from amazon here: https://www.amazon.com/gp/product/B005QRMAJG/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1

i am not sure how effective they are but i will test them when i get a chance.