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I would try to fix up your current printer, and get a laser cutter. They are far more versatile for large objects, much faster than 3D printers, and can cut any material other than metal or glass that comes in flat sheets. A hackerspace near where I lived ordered one direct from China with a 2' x 3' cutting area and 80W laser for $5000, as an example of how much you will spend. Ordering from a US based importer will cost you more.