I got annoyed by how my headphone extension cable, just hanging over the edge of the table, would drop to the floor as soon as I detached my headphones. So I designed a simple piece that you could fit the extension to and just slide on to the table.
My first print of the model had a size too small for my headphones but I noticed that I instead could use that one for my mouse and keyboard. Which works great since I can now give more cable slack to my mouse! And it all looks much cleaner now.
Fits the IKEA BEKANT table but should work with any table with 1.6cm thickness.
Print on its back and you don't need any supports.