This is an attempt to repair the back wheels of an Evenflo stroller. The wheel hub breaks after some usage and I have seen strollers on street with broken wheels.I bored out the hub which included the broken plastic on a drill press. I then measured the inside, and designed and printed a new hub. The design was done using Inventor, and printed with a MakerGear Prusa RepRap printer. The trick was to print with 100% infill for added strength.I have a blog post for this: http://ehsanshojaei.wordpress.com/