I’m finding Gorilla Glue works wonders for plastic parts broken from bending or shearing forces. I’ve had a few things around the house that have broken and led me to think I should 3D print replacements. I glue them to buy a few days or weeks and the glue ends up bonding so well that I have yet to print replacements yet.
Another good technique for hard plastic is plastic welding, especially for clean snaps. Basically using a soldering iron to melt the plastic back together. Seems to be as strong as before. Plenty of good YouTube videos showing the technique.
