If you are looking for a power socket holder, there is many different for the BLV cube on thingiverse. So why did I create a new one.
I wanted to have the correct orientation, to have the switch at front and the power cable at back. I also wanted to have the power socket mounted on the side of the printer, integrating the corner plate but also be able to have later a side panel fitting on the socket. And of course I wanted to have some really strong so there is no risk of having the socket breaking off and ending in my hand !
You can find the STLs on Thingiverse. Happy printing !