Diagnosis
That's the sound of the ice ejector blades scraping against the frozen ice mold. It's either ice adhesion or a mechanical fault in the ejector mechanism.
How to Fix It
Immediate stop: power off and unplug. Manually remove all ice from the basket and the mold. Inspect the silver ejector blades inside the ice mold for visible damage or misalignment. Manually rotate the blades with your hand (you can usually access them through the top) to feel for grit or binding. A thorough clean is step one—mineral scale can jam the mechanism.
If That Didn't Work
The gear motor that drives the ejector blades may be failing. Listen closely: the grind happens at the very end of the cycle when it's trying to twist and release ice. If cleaning didn't help, this points to a worn motor or stripped plastic gears.
Heads Up
Never force ice out of the mold with tools. You will bend the delicate ejector blades and cause this exact grinding noise. Always let the machine eject on its own or thaw slightly if stuck.