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That is a machined aluminum heated build plate with a removable Borosilicate glass printing surface that was manufactured by BC Technological Solutions, located in the south-eastern part of the USA. The printer featured also has aluminum arms installed that were also produced by BC. As of one year ago or more they were no longer producing and shipping any new products, but here is the company's website if you would like to take a look at it: https://www.bctechnologicalsolutions.com .