This is a customizable adapter between the wooden train track (BRIO) and DUPLO constructions. It is customizable, you can tweak it at the below link to match your requirements and download a printable STL. UPDATE: many new parameters introduced. The adapter can now serve as a ramp, bending flat wooden train into an upward sloping or downward sloping. For long slopes, there's also a tilted middlepiece. See instructions. Link: http://beta.gigmade.com/2015/03/duplo-brio-adapter/ UPDATE: the sloped pieces work fine, see pic. From initial playing, it's probably best to choose a slope around 30%. The piece that converts the flat into raising slope could be chosen slightly longer than the default, to avoid trains touching the floor.Customize These parameters can be used to configure your own duplo brio adapter on its [link] (http://beta.gigmade.com/2015/03/duplo-brio-adapter/): Examples Using the default parameters, change