 SANTA FE, NM ACCESSWIRE June 2, 2021 Sigma Labs, Inc. NASDAQ:SGLB Sigma Labs, a leading developer of quality assurance software for the commercial 3D metal printing industry, will present at the 2021 LD Micro Invitational XI being held virtually and will take place on June 8-10, 2021. Sigma Labs President and Chief Executive Officer Mark Ruport will host a virtual presentation during the conference, where he will discuss the Companys recently released PrintRite3D Version 7.0, First Quarter 2021 earnings results and announced key contract wins. 