Herring is right. You can't go by share price, you have to look at Market Cap. For SGLB to be at the CURRENT market cap of Camtek, SGLB would only have to be trading at .23, However, I don't think its impossible for SGLB to eventually reach a market cap of $550M which would mean trading at approx $1 per share. But we are talking full commercialization for an extended period to realize that type of gain.
At a value of 20x earnings Sigma would need to have about $27.5M/year in revenue in order to justify $1 share price.