This is a tool that is designed to squeeze liquid filled packets in an orderly fashion. Place the packet edge in the squeezer (for example, a mac-n-cheese packet) and give it a slight turn, cut off the corner opposite the key. Then turn the key to squeeze all the contents out. The packet will turn slightly and bring the cut corner even with the two rollers as you turn it. Yes, you can just use your fingers but this is more fun and does a better job of squeezing.

You need the following parts.
1) Key, 2) Small Ends, 2) Large Ends, 1) Handle, 2) Rollers and 4) #0-80 x 1/2" Long Socket Head Cap Screws or similar to bolt it together.

Build the following parts on your 3D printer.
1) Key, 2) Small Ends, 2) Large Ends, 2) Rollers, 1) Frame.
Bolt together using the 4) #0-80 x 1/2" Long screws.

Place packet even with and between rollers near the small end of the tool. Crank the key to draw the packet between the rollers. The packet will turn and force the contents of the packet out of the snipped corner. As you crank it, the packet will move towards the large end.