Cable Clips

thingiverse

I use it as a clip for PC cables, but it's really versatile - you can attach it to anything. To make one, print out two identical pieces and a single pin. Then, pound the pin into the hole using a hammer, securing the top and bottom together. The result is a custom clip that fits your needs. Since the bottom is flat, you can stick it in place with a command strip if needed. In theory, you could scale up this design to any size, giving you an endless supply of clips for whatever project comes your way.