A replacement for the standard ashtray in the RRC to turn into a nice bin for a phone/wallet etc. uses a friction fit like the standard ashtray and is printed in two parts and assembled for nice easy printing without using supports.  Designed to be assembled with ([https://www.mcmaster.com/96817A423/](https://www.mcmaster.com/96817A423/)) however I would imagine that any m3 screw would work quite well.