Butterfly Knife

This is a remix but scaled up to %150 Assembly: Push weights into the holes at the bottom of each handle. It is easy to force one half of the weight in initially and then push the rest in with the palm of your hand. Placing the handle on a table and doing this may help. This model uses unused filament as the hinges as it gives a very smooth and consistent feel that simulates a real butterfly knife. For the hinges, thread unused filament through each of the four holes and cut it flush. Preferably, melt or glue these into place so they do not come out with repeated use.