I just finished my optimized air flux box for my gekko newpac Work only for the gekkoscience USB HUB (the best...) For a best cooling i removed the top HUB cache.
Due to my printer size bed i needed to cut the box to 8 parts, you need to glue them, but it work
Here is the stl files if you want.... You need two 9 cm classic PC fans, the up fan let in the fresh air, and the second fan get out the hot.
With this setup i can run them to 600/615 mhz without problem
PS : Do not glue the top and the bottom, same for the fans, do not glue them if you want to remove dust or craps... The glued angle pieces are enought to keep them in place.