Creality has developed what they call an “Infinite-Z 3D Printer.” By tilting their nozzle at a 45-degree angle that prints onto a conveyor belt, rather than a fixed bed, their 3D Print Mill can theoretically print to any length.
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Of course, in reality you’ll be limited by outfeed, but the development team has successfully printed in lengths up to six meters (about 20 feet). “All in one piece,” they write, “produced by a machine only 66cm (about two feet) long.”
The Kickstarter funding is bonkers; they were seeking just $13,000 to get production going, but at press time they had $947,760, with 24 days left to pledge.