Review on Creality Compression Springs Printer Leveling by Vedavyas Fleming

If your 3D printer doesn't come with the correct machine springs, this would be a great upgrade! I have an Ender 3 and the height of the bed changes between prints, changing wildly between cold or warm. After installation I no longer have this problem. Note that you may need to lift the Z-stop switch 2-4mm to avoid folding it all the way in during installation.