From ghacks:

It is possible to add any printer to the Send To menu. To do this we have to open the SendTo folder which is located in Documents and Settings / userprofile / if you are using Windows XP and in the AppDate \ Roaming \ Microsoft \ Windows folder if you are using Windows Vista.

Create a new folder in the SendTo folder and name it Printers.{2227A280-3AEA-1069-A2DE-08002B30309D}. The icon will change to the printers icon and you can double-click it to access all of the known printers. Drag and Drop the printer(s) into the SendTo menu which makes them available in the right-click menu.