It is a open-loop control system that tries to predict and counteract vibrations in a actuated system such as a 3D printer. The first couple of minutes of [this video](https://youtu.be/Fe_BFGg_ojg) explain a bit more.

# Use
## 3D Printers
This year, 3d printers have become 10 times faster while keeping the same print quality mostly because of input shaper technology. The guy in the video above uses a frequency test suite to test for resonance peaks. Next to the large peaks there are often small peaks that often correspond to screws that are slightly loose. In the image below you can see a pre / post tightening of all screws of the frame. The first of the doublepeak around 40Hz completely disappeared after the tightening.
![[Pasted image 20240312175212.png]]