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I made a case to protect my darts when taking them somewhere. Here are some more images. The case was made to fit a specific model and it's not very parametric till then end, so I'm afraid it's not super useful for others.
It was made in #FreeCAD 1.0 which was super smooth!
If you wanted to try to make your original rubber band idea work, you could try moving the central dart up slightly so that the rubber band forms a triangle shape and adjust the contact points between the rubber band and the darts to be at each corner of that triangle
Yeah, I think I see what you mean. I'm very plastic conservative so I hope I can go without printing a second one, therefore the clip idea. Also the clip is a bit more practical better looking.
That's fair