Just a replacement part for a foldable camping chair. If it has rivet axles, you''l also need a set of flat-headed bolts, washers and nylstop nuts. I'd suggest to print this at 100% infill, my practice alsо shows that PETG is ok.

Plug.stl is not necessary, it's a fix, when open tube mount hole is damaged (mine was). I've just hammered it inside a tube and refreshed a hole by a 4.2 mm bore before assembly.