# \[Proposal\] Forbidden velocities for printer steppers

**URL:** <https://klipper.discourse.group/t/proposal-forbidden-velocities-for-printer-steppers/3995>\
**Category:** Developers\
**Created:** [August 29, 2022, 8:39pm UTC](https://klipper.discourse.group/t/proposal-forbidden-velocities-for-printer-steppers/3995 "2022-08-29T20:39:47Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![LifeOfBrian](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/lifeofbrian/32/2380_2.png) [@LifeOfBrian](https://klipper.discourse.group/u/LifeOfBrian)\
**Post date:** [October 9, 2022, 3:12pm UTC](https://klipper.discourse.group/t/proposal-forbidden-velocities-for-printer-steppers/3995/12 "2022-10-09T15:12:36Z")

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Often lighting is everything.  
I can’t explain the effect of input shaping on VFA. Especially on straight lines when it is occurring everywhere.

CHM can be easily set in the TMC5160 section via driver\_chm: 1  
But I don’t know about the fast decay time…  
In CHM=1 mode the stepper motors are really loud and varying htstr affects this so it seems to alter the fast decay time but I don’t know about the MSB and TFD.  
We only seem to have TPFD parameter.

Let us continue this in my thread even though this thread is about avoiding VFA too.

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_[View the full topic](https://klipper.discourse.group/t/proposal-forbidden-velocities-for-printer-steppers/3995)._