# Modification of Pressure Advance for high speed Bowden printers

**URL:** <https://klipper.discourse.group/t/modification-of-pressure-advance-for-high-speed-bowden-printers/13053>\
**Category:** Developers\
**Created:** [January 12, 2024, 1:31am UTC](https://klipper.discourse.group/t/modification-of-pressure-advance-for-high-speed-bowden-printers/13053 "2024-01-12T01:31:51Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![koconnor](https://avatars.discourse-cdn.com/v4/letter/k/aca169/32.png) [@koconnor](https://klipper.discourse.group/u/koconnor)\
**Post date:** [January 24, 2024, 5:37am UTC](https://klipper.discourse.group/t/modification-of-pressure-advance-for-high-speed-bowden-printers/13053/14 "2024-01-24T05:37:06Z")

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> [@dmbutyugin](#):
>
> Perhaps that could contribute to non-linearity effects, but it seems this cannot explain the effect completely.

I ran some simulations and I think that `pressure_advance_smooth_time` may have a notable effect on `pressure_advance` calibration (and a non-linear impact). However, it seems to be for different reasons than I originally described. I don’t want to derail this thread, so I started another thread at [Pressure\_advance\_smooth\_time skews pressure\_advance](https://klipper.discourse.group/t/pressure-advance-smooth-time-skews-pressure-advance/13451) .

I agree that pressure\_advance can have a complex reaction with input\_shaper. And I agree that modelling that interaction may be an interesting approach to improving quality.

Cheers,  
-Kevin

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