USB plug
thingiverse
Here's an adapter made just for the job, to shield the USB port from dust. With some ports on my router mounted vertically on a wall, I created one and printed it out. I'm not sure if it'll fit two adjacent ports, though - mine are pretty far apart. Feel free to customize as you see fit.
Download Model from thingiverse
With this file you will be able to print USB plug with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on USB plug.