Exhibit 23.3


Consent of Independent Auditor


We hereby consent to the use in the Prospectus constituting a part of this Registration Statement of our report dated November 6, 2020, relating to the combined financial statements of EnvisionTEC Group, which is contained in that Prospectus.


We also consent to the reference to us under the caption “Experts” in the Prospectus.


/s/ BDO USA, LLP  


Troy, Michigan

January 28, 2021