I can see the 3D being useful on short run kits of rail stuff , in fact the diesel engine that I mentioned is available to order , being made in small batches (whatever that means) . It does give a quick fix at a reasonable price to bung some detail under the bonnet of a field loco . It looks good , but having no use for one I have not even handled one , so cannot vouch for the finish which looks good in the advert photos . In any case , the model engines out of plastic kits are ideal for that----I have several waiting for a home because you cannot see them on a model with the bonnet shut , so why go to all the trouble of fitting them ?
I think the main point that the article above brought out was people will use it for the sake of it rather than stepping back and having a think . Some of the latest CNC Milling machines will do a heck of a good job , quicker and less expensive than the current crop of 3D (apparently) . According to my engineering contacts they are not yet cost effective . Certainly , they are not going to chuck out a very costly CNC Mill to produce bits , and that is the main obstacle to their introduction into industry .
There are also other techniques in the pipeline which may be preferable from an engineering standpoint .
I expect 3D will be useful when it has matured a bit .
Mike
The most memorable people in life will be the friends who liked you when you weren’t very likeable .