MINECRAFT building blocks without magnets

I made this Minecraft blocks for my son to play with, and it turned out to be worth of sharing. Basically you have a base block, and then you can add various textures to it and join it with a coupler.NO MAGNETS REQUIREDThe bond between blocks is really strong, you can lift 30-40 of them on one joint. That makes the construction really sturdy. I made a few print profiles already, but I hope the community will also participate, so I am sharing STEP files as well. Feel free to remix this design. To join blocks togetger, you will to need to print the couplers as well. From my experience, print a lot of them ;) It is quite hard to assembly at the beginning, but then you'll find a handy way to do this. Kids under the age of 6 may have a problem though. Please watch after the kids under 3yo, because there are some small elements in the set. HAVE FUN!