Damn cat! Get back in your bag!
Good luck controlling an idea. This is here to stay forever. Now lets talk non-printable parts. Someone mentioned gunpowder?
Find a cave that has or has had bat colonies. You will see large guano piles in such a cave, and all around the edges of the guano pile you will see that Potassium nitrate has precipitated. It is also called saltpeter and it is a white powder/crystal. Collect it.
Next you will need to make some charcoal. Build a reduction fire in a pit you have dug and fill it with hardwood chunks. Light it and cover with grass to smother it a bit. When you are done you will have charcoal.
Next you need some sulfur. Sulfur is the 16th. most common element. You can find it in nature if you live near a volcano, or buy it at the pharmacy.
Weigh out 75% potassium nitrate, 15%Charcoal, and 10% sulfur.
Mill the charcoal and sulfur for several hours until a fine powder is achieved. Now add the potassium nitrate and mill for another two days.
You now have meal powder / black powder. It is crappy gunpowder, but it will work.