I made this to go in an Gnedby CD shelf from IKEA. The fixed middle shelf is 20 mm thick and a little over 160 mm wide. This holder is designed to hold larger headphones like Sennheiser HD 600.Settings for my UMO+ and Cura: * Shell thickness: 1.2mm. * Top/bottom: 1.4mm. * 100% infill. * 0.1 mm layer height. * 80 mm/sec. * Print time: < 6 h.