Convert a Plastic Bottle Into a Sturdy String
Do not throw away the empty plastic bottle yet. You can make super strong strings out of it using a few basic hardware components.
If you have a few empty plastic bottles, the user Instructables Ehlers_TV can offer a cunning method of converting potential wastes into useful materials. With a cheap pencil sharpener blade and a few washers and screws, you can slowly separate the bottle from the long plastic string. Start by carefully removing the bottom of the bottle with a safety knife, then turn the bottle against the blade as shown in the video above. You are left with a batch of plastic rope that you can use for just about anything.
DIY plastic thread (from a PET bottle) | Instructables