# Why is the filament being retracted?

**URL:** <https://klipper.discourse.group/t/why-is-the-filament-being-retracted/16830>\
**Category:** General Discussion\
**Created:** [June 4, 2024, 1:58am UTC](https://klipper.discourse.group/t/why-is-the-filament-being-retracted/16830 "2024-06-04T01:58:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![AndreKR](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/andrekr/32/6956_2.png) [@AndreKR](https://klipper.discourse.group/u/AndreKR)\
**Post date:** [June 4, 2024, 1:58am UTC](https://klipper.discourse.group/t/why-is-the-filament-being-retracted/16830/1 "2024-06-04T01:58:49Z")

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### Basic Information:

Printer Model: FLSUN QQ  
 MCU / Printerboard: MKS  
 Host / SBC: Pi 3B  
 [klippy.log.zip](https://klipper.discourse.group/uploads/short-url/voVDX1MtxuTBXSjMXAGVVzV9ak5.zip) (22.0 KB)

### Describe your issue:

Have a look at [VID\_20240604\_c.zip](https://klipper.discourse.group/uploads/short-url/uPg4o0OYlv0js1KQLDZQhRiybOW.zip) (359.7 KB). It shows the filament going back and forth while my printer is printing the bottom of a cube, this part:

 ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/0/02542e2f68adff2094af0abe4eec1624f9932555.png)

The corresponding part of the GCode looks like this:

```gcode
G0 F12000 X6.853 Y-8.419
G1 F3600 X8.419 Y-6.853 E38.88573
G0 F12000 X8.419 Y-6.288
G1 F3600 X6.288 Y-8.419 E38.98596
G0 F12000 X5.722 Y-8.419
G1 F3600 X8.419 Y-5.722 E39.11282
G0 F12000 X8.419 Y-5.156
G1 F3600 X5.156 Y-8.419 E39.2663

```

For what it’s worth I do have `firmware_retraction` enabled:

```ini
[firmware_retraction]
retract_length: 2.6
retract_speed: 60
unretract_extra_length: 0
unretract_speed: 60

```

My question is, why is the filament going backwards during this part of the print? There are no G10/G11 commands and the E value is steadily increasing. What’s going on here?

The GCode viewer in fluidd also shows retractions, but strangely only on the first layer:

 ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/9/99975d86276d53f41507f547789fe4bf0971ff72.png)

Here’s the gcode file: [tb\_test.gcode.zip](https://klipper.discourse.group/uploads/short-url/ggcw4zrLYqYClukB08nAwy4Tf5Y.zip) (56.4 KB)

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<div class="post-metadata">

**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:** [June 4, 2024, 8:12am UTC](https://klipper.discourse.group/t/why-is-the-filament-being-retracted/16830/2 "2024-06-04T08:12:03Z")

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Most likely you are seeing the effect of Pressure Advance.  
Your setting of 1.04 is extremely high and could be indicative to various issue:

- Long bowden
- Low quality bowden
- Bad bowden couplings
- Unlocked bowden couplings
- Generally low extruder quality or worn out extruder

Respectively, one or any combination of the above.

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\
**Post date:** [August 3, 2024, 8:12am UTC](https://klipper.discourse.group/t/why-is-the-filament-being-retracted/16830/3 "2024-08-03T08:12:29Z")

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