Nylon is a tough and semi-flexible material that offers high impact and abrasion resistance. It is an ideal choice for printing durable parts, especially threaded fasteners. We newly update the packaging for small nylon pieces like these: a nylon cage! It's seamless, printed together with the parts. You can just open it using scissors.
https://www.facfox3d.com/3d-printing-service/sls-3d-printing-service/sls-3d-printed-small-nylon-pieces.html