a 12 oz soda can through a 4” thick concrete wall at a stand-off range of 20′, not bad for a garage-built system. Given the interest in the MIT coffee can radar course, I worked with ...

After two years of dreaming, designing, and doing, [Andrey Rudenko] has finally finished 3D printing his concrete castle ... was testing the thing out in his garage, and now there’s a beautiful ...