I’ve been sewing for 20 years and have never had one of these. My method for disposing of cut threads and little scraps of fabric is to throw them on the floor around my workspace and then wait until cleaning day to sweep them. No lie! Hopefully this useful object will keep my sewing area cleaner.
I used more of that thrift shop black duvet cover for this project. I stabilized it a bit with two cardboard inserts and added a magnetic snap so it can be out of the way when not in use.