I needed some headphones hanger for my son´s Marshall Mark IV, and he has an IKEA Mittback desk with a thick tableboard. I decided to adapt the trestle and create some almost invisible support for it. It prints in place, it is sturdy and works great. It can be setup upside down if the tableboard is high.

Print all the pieces and glue the hexagonal peg as desired to the headphone hanger and to the interface with superglue. Circular pegs can be secured with tape if needed or scalated a little bit higher.