This is a little niche, but I have a Ninja food processor that requires the lid to be on for it to operate. It achieves this by having this little sloped tab on it that depresses a safety switch in the handle. Well, it broke and they don't make the model anymore, plus I would have had to buy the whole bowl and lid for about $70 (crazy). So I designed this a few years ago when it first broke and it's held up since then until it failed yesterday. So I just printed another one and figured I'd share. I did have to drill a couple of small holes for the posts as you can see, but it's better than just super glue. Speaking of super glue, I used a lot for this. I basically used a normal amount to fix it together, and then I welded the seams with it.