# Firmware retraction is slow moving, slicer or klipper problem? **URL:** \ **Category:** General Discussion\ **Created:** [June 12, 2023, 8:08pm UTC](https://klipper.discourse.group/t/firmware-retraction-is-slow-moving-slicer-or-klipper-problem/8944 "2023-06-12T20:08:14Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![BultiZ](https://avatars.discourse-cdn.com/v4/letter/b/4af34b/32.png) [@BultiZ](https://klipper.discourse.group/u/BultiZ)\ **Post date:** [June 13, 2023, 12:00am UTC](https://klipper.discourse.group/t/firmware-retraction-is-slow-moving-slicer-or-klipper-problem/8944/4 "2023-06-13T00:00:42Z")
> [@Blackstump](#): > > [Configuration reference - Klipper documentation](https://www.klipper3d.org/Config_Reference.html#extruder) You sir should be awarded an gold medal and an high five, i feel so stupid! Ofc i need to define more movement if i klipper should do the movement instead of the slicers “assumptions”… I went with ```auto max_extrude_only_velocity: 60 max_extrude_only_accel: 1500 ``` and now it works flawlessly, had even to turn down ret-speed to 40 whilst printing to not slip grip on filament! Is there any deeper math or study to find best accel speed? Cant thank you enough i was so sure it was some slicer setting so this would taken ages! ![IMG20230613014811](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/3/3e59f641b990272bdce4cad7910536332670d1de.jpeg) Just look at the progress, now i was able to print my bracket no problems at all at speeds i didnt think was possible with bowden with this quality 💪 --- _[View the full topic](https://klipper.discourse.group/t/firmware-retraction-is-slow-moving-slicer-or-klipper-problem/8944)._