Yeah, the set is stupid expensive, not to mention the software that it pairs with.
Fairly easy item to knock off via 3D printing, maybe with the improvement that you can print up whatever radius / angle combos you like, with ends that plug together. Could save printing on parts by making plugs that fit in the end of PVC pipe and mate to your curves.
Then again, maybe its a more complicated than I'm thinking... because I'm basically thinking "tubular Legos".
Those claps are pretty sweet, but again, look a bit $$$ for what you get. Couple of hose clamps bridged together would work. Or for the light stuff we use on bikes, aluminum tape, cutting away the sections where you want to tack weld.
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