The USB panel mount as seen on https://www.wanhunglo.com/2019/diy-usb-and-sata-panel-mount-connectors-p13 If you can, please use the RSDOC (RS DesignSpark) file as that's my original source file. The STL is just an export that might not have had the perfect settings for your printer and/or application ticked or might even be incomplete.