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I've had a couple of this style of plastic clip crack. Wrapping it in thread and then applying super glue seems to work pretty well. I also tried wrapping with fishing line, but it came undone pretty quickly. Just wanted to share the tip! Now if only I had a fix for when the prongs on the other half break off.
Superglue sucks ass for vertical stress. If plastic like this breaks, it's best to replace the entire piece. Either buy a replacement or print a new one, if you are sufficiently equipped.
Looks like the thread is handling most of the force, and the glue is just keeping it in place.
It looks like the thread is keeping the upper part from slipping out, yes. But that still creates vertical stress on the glued part. And the thread won't hold long either, is my prediction. It will loosen over time. Repairing something sometimes means replacing parts and that's the right approach here.
Yes, but temporary fixes are the most permanent.