I had to extend the power outlets with an electrical extension cord for my desk and since I don't really like the cables to be on the floor or visible, I decided to put the extension mounted under the desk. The mount bracket is simple enough, catching both ends of the extension. Obviously, you need two of them printed.
The model was made using SketchUp 2017 Make and the source file is attached as well. Fell free to use it, change it as you need, and if you like it you can buy me a coffee ;-)

Creality

K1C

No

No

0.24

25%

Position the bracket on the side, to avoid support. I have used 4 lines for the walls just to make it a bit stronger.