But how many do you think are possible. If you were to capture the whole market, because your product is the best and you outsell your competition, how many would you end up with?

All 7 billion humans isn't your target. Maybe someday, but not right now. How many people are there with 3D printers? With things to print?

The replies are nested too deeply. There's about 5mm people who own 3d printers. Not all of them will be interested in putting their stuff on my platform so I think 30% of those is a realistic number.