EMT (Electrical Metallic Tubing) conduit is affordable, reasonably sturdy and readily available. A company called Maker Pipe makes it easy for you to build stuff using EMT.
Their eponymous product is a series of steel connectors for joining the pipes. In addition to 45-, 90- and 180-degree connectors, they offer T-connectors, an adjustable-angle version, 4-way connectors and even 5-way connectors.
They come in different size and can cover ½", ¾" and 1" conduit.
You only need a single tool to work with these: A 5mm hex wrench. (Well, and a pipecutter.)
The connectors run roughly $3 to $6 a pop, with lower prices available in bundles.
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