Grease the bearings and clean the linear rails/rods Besides that, they are really cheap, so there’s no reason not to perform this upgrade. This type of nuts doesn’t require any kind of grease and usually they have better tolerances compared to the regular brass nuts. If you don’t want to do this 3D printer maintenance task in the future, I strongly recommend upgrading to POM nuts. After cleaning the lead screws, you can install them to the printer, and grease them. You might want to repeat this process until they look like new.
If you see signs of wear, then I recommend taking out the lead screws and thoroughly clean them using an old toothbrush and isopropyl alcohol. For this task, I use a paintbrush and I “paint” some grease across the full length of the lead screw. If your lead screws don’t show any signs of wear, like a darkened layer between the leadscrew steps, then it’s good enough to just simply add a bit of grease and perform a few movements to make sure it’s spread well.
