 SANTA FE, NM ACCESSWIRE October 14, 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 Thursday, October 21, 2021 at 4:30 p.m. Eastern time to discuss its results for the third quarter ended September 30, 2021. 