I'm sure there are machines that could be successful at constructing lightsabers but to a degree that matches one made by a Jedi...impossible in certain aspects. A lightsaber is more then a saber that is built from an assortment of parts; it is one's own. The perfect weapon for any being is a weapon that is truly theirs; a weapon that is forged and shaped from the image that they hold in their heart and mind. For a Jedi, they have the Force and hours (sometimes days) of meditation involved to select the perfect crystal and the perfect parts to create a saber that is an extension of their mind and body. One could go for a standard metal hilt, one carved from greel wood, or the hollowed-out tooth of an animal. A standard adegan crystal, krayt dragon pearl, or durindfire? It is the individual and their own personal preference that allows them to create the weapon that they will be carrying for the rest of their life (barring anything happening to it of course ). And as it is the Force that guides them to select the perfect components, it is the Force that allows them to bind them together, linking them on something more than a mechanical or material level so that they would work with unimagined efficiency. Without this careful seasoning and conditioning of the lightsaber, the blade would be flawed and would fail the user. No matter what parts a Jedi may decide to use, they would want them to mesh as if they belonged together. Such a thing cannot be accomplished by an ordinary machine. For a real world example, the most valuable and exceptional katanas are still those made by the traditional methods of master smiths. Despite the numerous factory-made ones that you see online and can be purchased for a couple hundred dollars, the difference between them and an authentic katana is the degree of individual, specialized attention from a high-level, master smith that not only knows what he's doing but actually gives a damn. EDIT: And I was gonna go to work but my truck is smoking due to a shot radiator so that's going to be a no-go Ah well, this just means that I can get some sleep and now I'll have time to make a post when I wake up!