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ATTENTION! Since handling the high current generator is not entirely safe, I do not offer any support for building it or acquiring the parts! I built a flock box myself for around €20, and you can also connect a separate grass master. The whole thing works with a 9V block and a negative ion generator that generates 20KV at 9V and 30KV at 12V. I use a 9V battery myself so that I can recharge it. I bought the cable, housing, switch and plug from Reichelt Elektronik for around €10. The negative ion generator is available from China for just €5. I also bought the aluminum sheet from the hardware store for €3. Adhesive tape, solder, etc. were already there.