Customisable Headphone Holder for a Two-Pole Stand

I needed a holder for my PS4 headphones and the most convenient place to put one was on the floor lamp (known as a standard lamp here in the UK) that sits beside my chair.

This is the result. It could do with a little finessing, but it works just fine and it seems pretty robust. The photographs were taken before I sanded the print smooth.

The lamp I'm designing for has two upright poles, 14.9mm in diameter, spaced 50mm apart (centre-to-centre). Your application almost certainly won't match