Realy Duplo Compatible 3D-Printing Optimized Brick (4x2)

Hey,

this is my first upload on Thingyverse and I'm happy to give something back to the community.
This thing has gone throug a lot of testing and is now in a state I feel comfortable publishing it. This is finally a Duplo compatble brick that:

- Fits! (see the video in the files)
- Is designed to be 3D-printed
- Has smooth endges as it should since it is for toodlers

What more can we expect of a brick?

Please let me know your thoughts and results!

PS: The blue brick at the p