[MovedGoalPosts]

1.5GB is a very big file. In turn that will take a lot of processing. Either the printer itself or it's print server will need a lot of memory to be able to handle that sort of size or it needs to be run through a robust computer that can do the buffering job. With that sort of file size regularly occuring I'd want the user to be able to dump his print data to whatever serves the kyocera quite quickly and for that data not to be coming back out again into the network. That means the kyocera being directly connected to the print spooler. I'd be speaking to the printer supplier to ensure the printer itself is configured optimally for that sort of file size. At 10Mb for tha average printer connection it's going to be shifting a 1.5GB file for some time. Although at 10MB that should still leave room for loads of other traffic.

Unless the printer is connected direct to the user's computer so he can print direct, traffic will be hitting your network with every print operation. That will be whether the printer is connected direct by ethernet to the network (and thus uses one of the computers or server as it's spooler service), or to a print server (specific networking device for the printer only). VPN is just a data connection method, it still passes over the same wires in your network to connect the workstation to the print server/spooler.