If you’ve ever experienced wavy lines in your FPV multicoptor feed, it can be really annoying. Also, if you hold your quadcopter with the motors on and can feel obvious vibrations, it needs to be corrected. Over time, the vibrations can stress the frame, screws, snaps, and glue that holds your quadcopter together.
Blades usually don’t come balanced, so it’s important to know how to balance them yourself.
Here are 2 great instructional videos on how to balance props, using simple tools. Both videos cover how to balance the blade as well as the hub.
Once you get the blades balanced statically, you may want to then want to use a laser to balance out the motors like these guys do.