The design needs to be adjusted according to the connector type, might not work with all the cables. Use at own risk.

There are two versions of the clamp fitting a different shapes of connectors. 

Manufacturing procedure:

• Material: PETG (PETG V0)
• 3D Printer: FDM 3D printer, average print time 1 hour (with Input Shaper on MK4)
• Slicer settings: 0.2 layer height, 6 perimeters, no supports, print in vertical position
• Post processing instructions: Clean the stringing
• Assembly instructions: Insert on the connected cables, check if the connection is tight enough. 

Credits: Designs used in the visualization

https://grabcad.com/library/iec-320-c13-cable-end-1

https://grabcad.com/library/power-cord-c14-iec-60230-1