LEGO bricks can be used to make forms for concrete. In this video I will show how I pour concrete directly into LEGO molds and how I use LEGO bricks to make silicone molds that can be used to make ...

This tutorial on how to cast metal parts from 3D printed silicone molds is a perfect example of how useful a 3D printer can be when you are looking to make a custom and durable metal part at home.