Raspberry Pi Open "Case"

With the arrival of summer I've been finding that passive cooling with a small heatsink is inadequate for any Pi under more than a light load. I wanted a design that had a fan blowing down onto the heatsink, but didn't want to mess around with an enclosed design that would most likely need a second fan to properly exhaust air out of the case. I was also too lazy to redesign a case for the new port layout of the Raspberry Pi 4. So I took the bottom of Credo's case (https://www.thingiverse.com/thing:1368797) and added holes for mounting the Pi to it so the bottom of the board would be protected, then I took niftymaker's 30mm fan mount (https://www.thingiverse.com/thing:2755779), fixed the spacing of the fan mounting holes, and added integrated standoffs. To mount the fan I used the screws that came with the "iUniker" Raspberry Pi fans I got from Amazon. They're not the greatest fans in the world, but only cost a few dollars each, and they have the leads to connect to the GPIO pins on the