USB Slot Block

thingiverse

To safeguard your USB port against unauthorized insertion or dust, simply print and insert the cap (or secure it with glue to prevent physical HID attacks similar to the 'USB Rubber Ducky Deluxe' available at hakshop.myshopify.com). Note that using this method may expose you to potential risks due to its limitation against USB-based threats, as some might argue, "Who needs USB anyway?".