The plastic hasn’t even been peeled away from the awning, but Blacksmith is open as of yesterday morning. Headed up by Greenway Coffee & Tea’s David Buehrer, the coffee shop is operating out of the popular leather bar Mary’s old building at 1022 Westheimer. A block west of Montrose Blvd., Blacksmith is Lower Westheimer’s second coffee shop to open in the last few months — Southside Espresso went in next to Uchi at the end of October.