Adapted from Input Shaping:
The frame of 3D printers are usually made of aluminum extrusions, thin sheet metal, or even plastic. These materials are lightweight and inexpensive, but they are also quite flexible. This is a problem when the printer is moving quickly because the frame will flex and then spring back, causing vibrations that are transferred to the print.
The most common symptom of this is “ringing” in the print also known as "ghosting".
In order to cancel the vibrations, you have to determine these parameters:
To determine them, you either print a rigning tower or a single layer frequency sweep.