I made this model for my mother last Christmas. It is a fully functional nutcracker i modeled after a a classic Toy Solider. Once you have printed out all three parts you need to insert the handle/bottom jaw into the main component, and then slide the rod into the holes to connect the two.
Of course you may not be able to get a perfect print in order to do this, in which case you will want to cut the main base into two parts front and back, where you can assemble the handle and rod more easily and glue the back on again. You MUST make sure that your bed is leveled when you do this, or you will NOT be able to connect to two pieces back together again and your print will not stand by itself.