Are you two years old and cant understand why you cant connect your Duplo Road roller to the back of your train? Are you a parent who is struggling to explain why you cant? Then this connector is for you! This is a slightly modified version of the original created by tomkalei https://www.youmagine.com/designs/duplo-train-connector . I tweaked the dimensions a bit and added a chamfer to make it a bit easier to snap together. Check the code on github here https://github.com/Jimbles/3DModels