Below, you will find photos diagramming which screws belong to which parts of the machine. All screws shown are 2mm hex (the middle-size allen key that came in your accessory bag). The photos are of an Ultimaker 2. If you have an Ultimaker 2 Extended, you will have an additional frame screw vertically on the side panels. The UM2+ and UM2 Extended+ panels are the same with the exception of the feeder. Do not remove any of the screws labeled "Frame Screws." All of your printer's motors and electronics can be accessed by removing the covers on the machine; the frame panels themselves never have to be removed.
THE BACK PANEL (feeder for UM2)
THE UM2+ FEEDER (other screws on back panel the same)
THE BOTTOM PANEL
THE LEFT PANEL
THE RIGHT PANEL
THE TOP PANEL