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It's a good idea to replace your bearings if you notice they are not performing well. By greasing your bearings regularly, you can prolong their lifespan and maintain smooth movement. When disassembling your printer, make sure to clean the old grease off the rods and bearings before applying new grease. If the rods appear to be in good condition, you may not need to replace them. However, if you notice any damage or deformation, it's best to replace them as well to ensure optimal printer performance.
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