I have had the video below by the King of Random saved to one of my playlists on YouTube for a while now and believe that it could be of great use to preppers.
This mini foundry can make quick work of turning your scrap metal in to something that can be of use should the SHTF. If you have decided to start storing metals for a rainy day then check it out.
Charcoal foundries can reach temperatures in excess of 1,000ºC, which is well above the melting point of hobbyists. This project should only be attempted with adequate knowledge and training, proper protective safety gear, and in a fire resistant area with adequate ventilation. The sparks flying from the foundry can ignite fires, and the fumes from burning dross can be toxic. Use caution and common sense. Use of this video content is at your own risk. – King of Random
Related: 35 King of Random Survival Videos