Copyright law is sadly complex and murky, but here are some reasonable guidelines... 1] If you are strictly providing a service to print an item for which you have been supplied the template, and you deliver the product only to the client, then you're *probably* safe from any infringement. You are protected by the reasonable expectation that the client has the right to reproduce, and you have not benefited from the transaction in any manner that causes a fiscal loss to the owner of the IP. That said, when IP becomes an issue to major stakeholders, there is the chance that you can be named in a lawsuit and may have to spend a lot of money defending your actions - your best recourse is to insure that, like Shapeways, you require customers to confirm that they have acquired the necessary reproduction rights. If the client claims they have the right to reproduce and don't, and they subsequently lie to you, then you're mostly safe (though you can still get named in a lawsuit and have to provide proof that you made a 'reasonable effort' to not engage in illicit activity). 2) If you are contacted by a potential customer who wants a print of something that someone else initially provided you with, and that item is NOT clearly in the public domain (and really, not much stuff actually is) then the best advice is to provide that individual with contact information for the person who originally submitted the template and tell him/her to do a private deal for the use of the template. The new customer can, if they get the data, provide you with their personal copy of the template data and you're once again off the hook as far as proving that you were just providing a service. 3) What you absolutely can't do is receive data from a client, fulfill their order, and then offer that item for sale UNLESS the item was clearly in the public domain in the first place, or you have a licensing agreement with that customer (one which proves that the client either had the appropriate reproduction rights, or that proves they lied to you about having the rights). Be aware that most of the printable templates on the net are not public domain - many are governed by either Creative Commons licenses or are property of an existing rights holder. Just because you can download an Iron Man mask template from a whole lot of places does not mean you have the right to print it and sell it. Just because a template is offered for free does not mean that you can print/sell it yourself - most often 'free' templates are offered for personal use only. 4) You also cannot legally reproduce an item that falls under the IP ownership of another individual/company, even if you create the necessary template data yourself. That said, mostly transactions like these fall under the radar of rights holders - producing a dozen screen accurate replicas for other dedicated fans at a small profit to yourself is probably not going to incur the ire of major rights holders, and that's why nobody slams down a ban-hammer on RPFers... mostly. But if you go down that road you *may* find a cease-and-desist letter arriving at your door, and if that happens then you should absolutely do as instructed. Otherwise you will likely find yourself on the wrong end of a battle with a very well financed team of lawyers that will spend you into oblivion. Bottom line - if you want to produce saleable prints without all the nonsense that goes with IP issues then only offer them to friends, family and the handful of folks you are certain that are prop fans and not lawyers fishing for fresh blood. If you're not sure about a client, then don't do business unless it's absolutely confirmed to be above reproach. Otherwise, it's the wild west out there and you're basically on your own.