The true value of 3D printing and Lego (or any construction toy) is the ability to print custom parts. For example, take a look at the Free Universal Construct

The true value of 3D printing and Lego (or any construction toy) is the ability to print custom parts. For example, take a look at the Free Universal Construction Kit which includes adapter bricks so that any of the following 10 different construction sets can connect to one another: Lego, K’Nex, Krinkles, Tinkertoys, Zoob, Duplo, Fischertechnik, Gears! Gears! Gears!, Lincoln Logs, and Zome. https://3dprint.com/9147/3d-print-adapter-lego-knex/ https://3dprint.com/9147/3d-print-adapter-lego-knex/ http://www.sy-lab.net/Free-Universal-Construction-Kit http://www.sy-lab.net/Free-Universal-Construction-Kit http://fffff.at/free-universal-construction-kit/ http://fffff.at/free-universal-construction-kit/