Summary Headphone Holder. This is designed to fit a 35 mm desk, although the dimensions can be easily changed. Some sanding and filing will be needed to fit the two pieces together. Feel free to customize it, but please credit me if you change the design. Print Settings Printer: daVinci Mini Rafts: No Supports: Yes Resolution: 0.4 mm Infill: 25% Notes: You will want to use a thick shell for this to increase stability.