Simple headphone, headset holder. I am using ikea's “LAGKAPTEN” table which have a nearly 3.4cm thickness but I designed distance as a 3.6cm for dont take a risk :D but it is so easy to change the gap with 3d software or you could just scale the gap from your slicer program too.

I used %10 infill with 25mm layer height also I used brim for extra security but it is already a too easy printable model feel free on printing settings ^^.