This thing holds a cable into a corner with a single nail. Just edit the "User-defined values" section to specify your cable and nail/screw diameter, width, tab length, and thickness and print a bunch out.

The default values (and the STL) are effective at pinning up a ~4mm cable with a small finish nail.

Update 12/30: v0.69 Fixed a bug that caused the nail hole to be placed too close the body on short tabs. (2 d/l)

1. Edit the parameters in the "User-defined values" section to specify your cable and nail/screw diameter, width, tab length, and thickness.

2. Print.

3. Install. I find it helpful to hold the nail loosely with a pair of pliers when hammering.