"Input shaping is a control technique used in computer-controlled machines, like 3D printers, to reduce vibrations and artifacts such as ringing or ghosting. It works by modifying the command signals to the motors to create an opposing vibration that cancels out the system's natural resonance, which is caused by the elasticity of the printer's frame and other components. This allows for faster print speeds without sacrificing quality." This is an AI overview and is more than enough to help one understand what your printer is doing and why... when you hear weird noises you don't think are a good thing. They normally are. Your printer is doing its job, intentionally. Remember to run your printer calibration at least as often as the users manual recommends. I love knowing that K2D2 is ripe, ripped and ready to masterfully produce whatever the ? I want, so I am happy to run the sequence just to warm him up. I did the same thing with half-million dollar CNC machines for most of my life. You need to love your machines!