A very quick print of a nut that fits quite a few different sized bolts.The concept is simple and I use it whenever I can't find a proper sized nut... And the hardware store is soooooo far away. It uses the soft attribute of ABS to allow the bolt to thread it's way through the material. for larger bolts, simply drill a larger hole. It works so well for me, I've used it without concern of when I get around to getting a proper replacement.