Holds a cable to the back of a desk.
Screw this clamp into the bottom back of the desktop. Pre-drill the hole to prevent the screw from pushing out the desk-wood.
I chose LAYWOO-D3 to match my wood coloured desk, but black or brown plastic might also look just as good.

The slot down the middle allows the arms to spring open wide enough to accept the cable.

Sizes can be changed in scad file to suite your desk and cable and screw.

I used LAYWOO-D3 on a Makerbot ToM with the following settings:
Skeinforge 50
Infill = 100%
Layer height = 0.40 mm
Shells=1
Feedrate=30 mm/s
Travel=30 mm/s
Temperature=220 C

Then wait a while before pulling off the print because LAYWOO-D3 takes a while to cool down and become stiff.