Duplo compatible brick with internal support structures for easy printing

This printable Duplo compatible brick has an internal support structure, which facilitates printing without additional supporting materials. Also, the central cylinder is notched for increased flexibility with plastics which are less elastic than ABS.

NOTE: this object has been superceded by http://www.thingiverse.com/thing:116411 which has better a better fit to original Duplo bricks and allows several brick sizes.