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When the extruder gears “click,” it usually means the filament isn’t moving smoothly through the hotend. The stepper motor pushes the filament, but excessive resistance causes it to skip steps, creating the clicking sound. On the Ender 3 V3 KE, overtightening the extruder tensioner can grind the...

Yes, you can use metal-filled filament (such as PLA containing copper, bronze, or stainless steel powder) on an Ender-3, but you will need a hardened nozzle, as a standard brass nozzle will wear out very quickly when printing with abrasive filaments like metal-filled PLA.