end cap for camping chair

A friend of mine restored two old camping chairs, of the type consisting of metal tubes with fabric for the seat and the backrest. The backrest is just two metal tubes that the fabric is put down over. My friend wanted end caps to put over the tube ends. So I said, I could print some for him. My makerspace had a 3D printer weekend, this was a perfect little project to do during that event.

This was a simple project, so I just used OpenSCAD to design it, and changed it until I was happy with i