Egg Slicer

To assemble this model, you will need some type of fishing line. I used one with a diameter of 0.30 mm.
To unlock the hinge, you will need to apply some force, but afterward, it will work normally. If you want it to work more smoothly, you can apply some lubricant to it.
It will not work unless the fishing line is tensioned, so try to make a strong knot.