A kit of parts to join tubes to make an A-frame.
Mine is made from fibreglass tent poles which are a bit under 13mm in diameter. These just happened to be on special at $4au for a set of four (plus other bits).
Otherwise I would have used 16mm curtain rod (which is tube actually).
It should be possible to re-scale the parts for other sizes.
My printrbot sits in a bamboo serving tray which has inside dimensions of 300*475mm.
The poles are 700mm long so the angle at the apex comes out close to 24 deg.

The parts are over engineered and are overkill to support a few kilos of plastic.

I have left some early versions of parts in the SU file.