This desktop model is designed for fun or classroom demonstration. The reactor separates hydrogen and oxygen from salt water via electrolysis using a 9V battery. The gases are collected at the top of the reactor. The gases can then be used to fill a balloon or create a loud pop if exposed to flame. This project is a work in progress. If you have any suggestions for improvement, please let me know. Good luck and happy science! DISCLAIMER: I do not accept any responsibility for injury or damage as a result of using this item. Gaseous hydrogen, when mixed with oxygen, is very combustable. Additionally, the wastewater produced by the item may be toxic. Be safe! The reactor was designed for use with ReplicatorG. Recommended Settings: 100% infill 1 shell Exterior Support All Others Default Print the four parts but do not print the entire assembly,(Reactor_Assembly.stl). It would not function. Afterwards, follow theses steps to get the reactor up and running. 1.) Place a 9V household battery in the slot inside the reactor base. 2.) Connect the Toxic Waste Collector to the tube extending from the reactor base. You may glue in it place to seal any holes if you choose. 3.) Slide the Floodgate into the slot in the Toxic Waste Collector. The floodgate prevents water from escaping the reactor. 4.) Fill the reactor with saltwater. The water can be from tap, mixed with a couple spoonfuls of salt. At this point, bubbles will rapidly rise from the battery terminals. 5.) Connect the gas collector to the top of the reactor. You may choose to fill the remaining empty space in the gas collector with salt water. Be careful though, as water may spill out during this step. 6.) Cover the top of the gas collector with clear cellophane or tape. Slowly but surely, bubbles will collect. It takes about an hour or two to get a useful amount of gas. That's it! If you run low on saltwater, simply add more via the small hole on the side of the gas collector. When you are finished with the reactor, the waste water should be disposed. It may appear brown, or green, depending on the battery and water used. The waste water is toxic, and may contain traces of battery acid. Proper safety equipment is a must.