Bag strap joiner
The joiner on my daughters Tinkerbell bag broke. This is the replacement I came up with. The pin didn't print very well for me. Probably would have been a better idea to lay it on it's side. Was almost impossible to get to slide in the hole. The bar, is a bit on the thin side, but it made it easier to slide in. Probably put some good gorilla glue on it once you know it will fit. I'm including the source code from openscad so you improve on the design if you wish to make one.
Oops almost forgot a little explanation. The bag had two strapping loops. Both were permanently attached, so you couldn't take the strap loose and string it through a clasp of some sort. That's why I designed the bar and the peg. Just insert the strap up into the housing, and push the peg/bar through the loop, so it holds the strap in place. Depending how much stuff you keep in your bag, the peg could be replaced with a screw and a nut.