Under Desk 3.5mm Aux Mount

Mount a 3.5mm aux extension cord under your desk to be able to cleanly plug your headphones in under your desk! 

Extension I personally used can be bought here on Amazon, designed to fit any aux extension tightly that are ~6.7mm thick

I personally used .1mm layer height to print with no supports on a Bambu P1S and it holds it snug, not too hard to get in/out but plugging in headphones won't cause it to budge!