About this 3D model

I've chosen to reinvent the brick used for buildings. My project is inspired by lego bricks for their modular shape and the possibility to put them together withouth glue. To avoid the need of printing them with 100% infill, I've inserted sixteen sphere shaped holes required to redistribute forces. I recommend to downscale the original STL file to 10% of the original and print it with 20% infill.