Ultra Portable Microfiber Screen Cleaner (laptop/notebook)

Step 3 Stick microfiber and cardboard together.

I did not bother using glue (not a bad idea) I just took the time to use thread. You will probably need to use thread, that should press hard on the edges, this should make sure bits don't fall in to your laptop. If you have skills then it may be good to try hemming the cloth, unfortunately I lack those skills.