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yea I guess if you start mass producing identical frames you probably wouldnt mitre tubes by hand anymore...
plastic waste wise, I agree it's not ideal. But also not terrible, these parts would not need to be very dense. And money waste wise it's not bad I think. each of these would cost below a pound.
RabiCycle
Ah nice yeah its a good idea, ive seen similar things that people have done to mitre tubes for roll cages and things. I think the challenge with a frame is that the angles vary so much for each frame that you would need to print a new pair each time for each tube, as @PhilDAS said you can get mitre templates out of bikecad. However itd be good if you had a batch of a few tubes with all the same fit.