This is a fan holder to cool down the processor board of MakerFarm Prusa i3 8".
A 60mm computer fan is placed between the gill and the holder and they are fixed together with four 3mm bolts and nuts.
The whole device is located on the side of the printer and is not required to be glued to it as its grip is quite firm.
I've connected the fan to one of the unused connectors from the ATX power supply that I use to power the printer. This way it is on all the time when the printer is in use.