I needed to mark rugs etc. for different purposes and am not able to stick to color etc.

So I needed something that survives washing machines temperatures and “holds” on to the fabric.

I used elbartos Key Ring (https://www.printables.com/model/78106-key-ring) and pasted a character inside / used the ring as charcter and "just" added the dashes for the Q. Voila.

Now there are washing machine safe (at least with the PLA I used, from OWL-SAT) little rings which can be attached to a rug (in a hole) and survive.