KNOTMATIC - Support for kids making knots on water bombs or baloons

It's getting hot here in Germany. My kids like to play with water and they even more like water bombs. Filling the balloons with water is easy. But making a knot is not so trivial for smaller kids. This tool gave me some hours back for relaxing while my kids where filling water bombs with ease!

Please look at the instructions how to print and how to use it.