to the vacuum inlet 112 this allows the user to fill the reservoir without contacting the powder air can also be injected into the container 9 which could be the container in which the powder is shipped from its place of manufacture through a compressed air hose 101 the compressed air aids in vacuuming the powder out of the container by making the powder flow more easily this technique can be automated so that the feed reservoir 102 maintains a store of a sufficient quantity of build material a vacuum system having an outlet that empties into the feed reservoir of the 3 d printer solves a variety of problems by making the process cleaner user satisfaction is increased and the machine is made more reliable because less airborne powder which can contaminate machine components e g bearing and electronics is generated by making the process more convenient less time and interaction is required by the user user satisfaction and productivity are increased once a physical model has been formed by the 3 d printing process it is necessary to separate the model from the unprinted powder described below it is also desirable to reuse the unprinted powder to those ends the vacuum.