Hi
designing and building this 1/35 Mi-6A, I may give my opinion on this technology
It's an other kind of scratch, much more expensive...well, not always, it depends from the size.
So, you can do big :
for some hundreds of euro.
you can also do small like those connectors
for 5 euros
You can design a tire in a couple of hours and get it printed in a few days
You have always to prime and grain the entire surface, taking care on the details.
You can make a master wrong, and correct it without rebuilding it.
As a 1/35 helicopter builder, this technic fits me because I can do 1mm thick walls (fuselage) which is good
because the helicopter is entirely hollow
So, so far, it's an unique model for myself, with the possibility to duplicate at the same costs, maybe only for some rich russians.
It is a complement to plastic, scratchbuilding, thermoforming, photoetching.
The next step after prototyping is to mill a mold. Do not dream too much, the 1/35 Mi-6 is too big for that, It's CAD learning project.
CAD and Microprototyping ? yes, for some impossible parts, or for a dream (crazy) project you can't get an other way
And yes, it had not be more work to scratch it from zero, but in this case, next step is impossible.
Hope this helps, we will see in time how it moves in the future.
Oh, I forgot, you can clean the parts with hot water, prime them with surfacer, paint them, glue them...
Norbert