Sigma Labs Inc (SASI)

[RiskReward1]

In my opinion, (as an investor who's not a technologist), the sort of technical question you're raising is likely answered (at least to my personal satisfaction), by the attachment to the company of 1. Mark Ruport (followed by) 2. Jacob Brunsberg (followed by) 3 Stephan Kuehr.

While their involvement doesn't prove that Sigma's technology will be successful...as the fate of these small companies is likely never knowable until things fully play out, to my satisfaction such industry insider affiliation and attachment makes a fundamental shortcoming of the technology, such as you seem to suggest as a possibility, unlikely.