I needed cup holders for a Citi Mini Double Stroller for adults and kids, so VIOLA! These were made to fit a variety of cups, especially the coffee mugs you can get at Disney Resorts! The adult cup holders are intended to bolt together using #10-32 screws and jam nuts. The kids cup holders are designed to click into where the optional toddler bar is supposed to attach to. I've also attached the SolidWorks 2014 source files. Have fun!I just used the standard setting on my Replicator 2 with 20% fill. To help reinforce it further, I'd also used CA glue on one, and melted the surface of the kids cup holder connecting rod with a soldering iron. My kids' cup holders both broke, but part of that was due to my printer not extruding properly, so my prints were less-than-ideal.