3D moulded sails are much different than something that is 3D printed
"3D moulds" have been around since the industrial revolution, probly longer, car panels, fibre glass parts etc so this is not a new revolution!
I got a 3d printer, they are very slow.
To make something the size of your fist takes hours to print
To 3D print a hollow structure requires a support structure so it dont cave in.
A long way off for the time being, not in my kiting life time.
The main canopy is relatively easy to make with large sheets of sail clothe.
This sail clothe is already cheap and easy to make in a very refined process.
the bit that slows them down would be all the small fiddly stuff like the struts, and leading edge, valves and bladders made of different materials and adding reinforcing material.
And then when you break the cost down the bar and lines are a large part of the cost.
And how much of the cost is for R&D
And how much is for profit
All these cost will still be there no mater how much they cost or how they are made
Cant see any compelling augments in the foreseeable future to change what works.