This is a dock for Rog Ally, you can put one or two fans to cool device. Top of the dock is used for hub that is connectd to ally. Hub that is used is UGREEN hub 7 in 1 

I used 360g of filament PLA and tree support

https://eu.ugreen.com/products/ugreen-usb-c-7-in-1-hub-with-4k-60hz-hdmi?variant=54084698407260