Answer for Is there any metal filament? If yes what kind and how much is the price for 1kg?

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    Pure metal? No. However, there anre many brands of metal "infused" filament you can choose from. These are almost always a mix of PLA and metal powder. The percentage of metal to plastic varies depending on the manufacturer. The more metal in the mix, the more brittle the filament tends to become. But, more metal also means better results when polishing or finishing. The common mixes tend be bronze and copper. You can also get stainless steel and iron mixes as well. If you are looking for a very high metal to plastic ratio, look into the ColorFabb metal filaments.