# Input Shaper without effect?!

**URL:** <https://klipper.discourse.group/t/input-shaper-without-effect/4946>\
**Category:** General Discussion\
**Created:** [November 15, 2022, 8:46am UTC](https://klipper.discourse.group/t/input-shaper-without-effect/4946 "2022-11-15T08:46:02Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\
**Post date:** [November 18, 2022, 7:02am UTC](https://klipper.discourse.group/t/input-shaper-without-effect/4946/14 "2022-11-18T07:02:16Z")

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> [@Berggipfel](#):
>
> The energy increased and the stiffness increased. My explenation: The reduction in damping by increasing the stiffness results in a higher energy of the natural frequency. If you place a ruler over the table’s edge and snap it,m it only starts to swing, if you press the ruler against the table (=decrease damping). Energy of the swinging is high.

Thinking this over, I can agree.

- Attenuation means that energy is “drained” in the system, e.g. by dampers or in our case lack of stiffness
- Higher stiffness of the entire system / frame means that more resonance energy is seen by the IMU
- PSD thus gets higher

Back to @LifeOfBrian printer:

**Printer y-axis:**

- The basic form of the graph looks OK
- The big Z component looks a bit fishy, although some Z portion is normal
- Could be an effect of the IMU mounting

On a bed slinger the IMU is mounted on the bed. How did you do this? Did you mind directions as noted on the IMU’s silk screen?

**Printer x-axis:**

- This graph looks like a mechanical problem
- For comparison see the following two graphs. The first one is always the messed-up axis (binding) and the second one the proper:

Modified Ender 5:

 ![1](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/b/bba884e0a361a819e50d82f560f1067a6f0319a9.jpeg)

Custom corexy easily capable of accels \> 20k

 ![2](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/f/fb56a09dbc229374b96c16d45d628d2e53a54f9d.jpeg)

- Take note of:
  - Very low PSD of the messed-up axis
  - Broad frequency spectrum of resonances of the messed up axis

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