eLab Hackerspace's blog, but I'm going to summarize it here anyway.
Tinkercad. It basically consists of 4 parts, the copper tubes support in the middle, the nails support on the back, the flyer support at the front, and the base where they all fit on the bottom. This was my first sketch:
Tesla Coil. I also added a push button to activate the thruster:
instructable which only uses some old oxidised copper coins, salt and lemon juice or vinegar. So, I grabbed some iron nails and cleaned them up with a wire wool to remove any oxidation and then put them into the solution, one at a time:
After all parts were printed, cut all the pipes the same size, and had the copper plated nails ready, it was time for a first test: