0.2 mm and 0.4 mm thick spacers for bed leveling on the Creality Ender 3 V3 SE:

Instructions:

1. Begin by creating a heightmap for your heatbed.
2. Use as many spacers as necessary to level your bed using the 4 nuts.
3. Unscrew the nuts, place the spacers UNDER the original spacers (near the cold end) of your bed, and then screw the nuts back into place.
4. Utilize the spacers according to your heightmap. For instance, if one corner of your heatbed is 0.4 mm lower than the others, use a 0.4 mm spacer under that corner.
5. After reattaching the nuts, consider generating an updated heightmap, then repeat the process until you are satisfied with the results. A deviation of 0.2 mm is generally acceptable.