Powerfix USB Powercube Clamp

Weeks ago I bought at Lidl supermarket a USB powercube with four 220v AC plugs and two USB ports.
It includes a wall support but if I left the cube on it one AC plug can not be used.

I designed a clamp in order to attach the cube in a table. With this the four AC plugs can be used.

I recommend to print "joint_9mm.stl" with at least 50% infill.