 SANTA FE, NM ACCESSWIRE March 10, 2021 Sigma Labs, Inc. NASDAQ:SGLB Sigma Labs, a leading developer of quality assurance software for the commercial 3D metal printing industry, will hold a conference call on Wednesday, March 24, 2021 at 4:30 p.m. Eastern time to discuss its results for the four quarter and full year ended December 31, 2020. 