We are singing the same tune. This industry will give you guys a entire world of new things to complain about though. The 3D models the game industry uses are conceived to a different standard than you will hold them too. The few I have looked at are not very dimensionally accurate.
Well, how accurate these parts and kits will be will depend on how accurately the 3-D modeling is created... just as the accuracy of today's kits depends on how accurate the tooling is.
Accuracy is one thing, the actual technology of printing in 3-D is another. You're right, though... we'll have to wait and see just how well these new 3-D items will be done. I have no doubt there will be sub-standard products coming from some sources, along with highly-accurate items from other sources... just as the quality and accuracy of today's kits varies all over the place.