Single or double shelf made for EU type socket. Should fit in most of available sockets.

Double socket is equiped with 2 holes for chargers, etc. I also added frame to prevent slipping small things of the shelf. The frame is separate for printing the shelf without supports. Use superglue to complete shelf and frame. 

Single socket has something like “anti slip” surface :D

Enjoy.

Print instructions

Layer height: 0.2 mm
Infill: 15%
Material: PLA (works well with PETG too)
Supports: only for Socket needed (from printing bed)
Perimeters: 3 (make it more sturdy)