In industry there are many times where an extraneous task suddenly turns into the critical path for a project. I had experienced this while working at Stryker on surgical cut guides that were 3D printed out of grade 5 Titanium. It was not observed until after the design freeze during a cadaver lab that the cut guides created a lot of debris while in use with the designated saw blades. The material selection and manufacturing process of the guide were originally simple and completed tasks, that ended up delaying the whole project because it now was leading the critical path.