https://www.youtube.com/watch?v=BU7ZYPHWDo4

PrintABlok are interlocking building toys created by the 3D Printing Professor, designed to work well on home 3D Printers. PrintABloks can be built in all 6 directions, allowing for gravity defying building unlike any other building block out there.

This is the base PrintABlok set. It includes variations on the basic blocks that allow for creation of amazing builds with advanced geometry. PrintABloks also make excellent prototyping tools.

If you are interested in getting a greater variety of blocks, including articulated blocks and decorative elements to build PrintABlok mechs, you can check out the full set here:

http://printablok.com