<p><strong>Mechanical?</strong></p>

<p>You basically answer your own question that there could be a mechanical issue.</p>

<p>If 93 steps gives you 38 mm, to get to 100 mm, you need to divide 100 by 38 = 2.63 times. This implies that you need 2.63 x 93 = 244.7 steps/mm (not 149.73).</p>

<p>You even tried close to 400 steps per mm to see you are not extruding 100 mm of filament. This implies that you are either missing a lot of steps (increasing the stepper current or increasing the temperature of the hotend would help out) or the extruder gear slips on the filament (increasing the pressure on the extruder gear and filament could solve this).</p>

<p><strong>Or not mechanical?</strong></p>

<p>Furthermore, it could be another issue than mechanical. If your extrusion rate is too fast, the stepper might not be able to cope the high speed and miss steps. I have had this before with a too high of a retraction speed.</p>

CC BY-SA 4.0
2018-12-17T10:50:55.637Z
I sorted the problem, I took the extruder apart and put it back together again (although I don't think this did anything), and I changed the rate that the material is extruded down from 100 to 60 mm/min which I think is the speed the printer normally prints at and I was able to follow your steps and get 100mm of material for a 100mm extrusion command.
Liam
CC BY-SA 4.0
2018-12-13T22:24:53.570Z
2018-12-17T12:35:30.840Z
2018-12-17T12:35:30.840Z
0scar
<p>I am attempting to follow <a href="https://3dprinting.stackexchange.com/questions/6483/how-do-i-calibrate-the-extruder-of-my-printer">these instructions to calibrate the extruder</a>, however when I increase the value for <code>DEFAULT_AXIS_STEPS_PER_UNIT</code> the change in physical output does not correspond with the changes.</p>

<p>I started by testing how much filament goes through the extruder when sending <code>G1 E100 F100</code> to my printer, instead of the 100 mm I get about 38 mm (<code>#define DEFAULT_AXIS_STEPS_PER_UNIT   { 80, 80, 400, 93 }</code> in Marlin). I increased the value to <code>DEFAULT_AXIS_STEPS_PER_UNIT   { 80, 80, 400, 149.73 }</code> which should take it to 100 mm, when I tested the physical output the increase was only negligible so I repeated the calculation with <code>DEFAULT_AXIS_STEPS_PER_UNIT   { 80, 80, 400, 387.8007 }</code> as the new value. The new physical output is about 64 mm, I think this suggests a mechanical problem rather than a firmware configuration problem, but I am not sure where to go from here.</p>

<p>My printer is the Ender 3, running Marlin 1.1.9 with a BlTouch and an <a href="https://www.amazon.co.uk/gp/product/B07DDGGN92/ref=oh_aui_detailpage_o02_s00?ie=UTF8&amp;psc=1" rel="nofollow noreferrer">aluminium bowden extruder mod</a> 
<a href="https://i.sstatic.net/TaeJ3.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/TaeJ3.jpg" alt="extruder"></a>
(installed after the extrusion problem began).</p>

<p>Any help you can give will be greatly appreciated.</p>

<extruder><extrusion><creality-ender-3>
When I attempt to calibrate extruder steps the increased values don't correspond to physical increases
Liam
# When I attempt to calibrate extruder steps the increased values don't correspond to physical increases

(Asked by: username_0 on 2018-12-13)

I am attempting to follow [these instructions to calibrate the extruder](https://3dprinting.stackexchange.com/questions/6483/how-do-i-calibrate-the-extruder-of-my-printer), however when I increase the value for `DEFAULT_AXIS_STEPS_PER_UNIT` the change in physical output does not correspond with the changes.

I started by testing how much filament goes through the extruder when sending `G1 E100 F100` to my printer, instead of the 100 mm I get about 38 mm (`#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 93 }` in Marlin). I increased the value to `DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 149.73 }` which should take it to 100 mm, when I tested the physical output the increase was only negligible so I repeated the calculation with `DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 387.8007 }` as the new value. The new physical output is about 64 mm, I think this suggests a mechanical problem rather than a firmware configuration problem, but I am not sure where to go from here.

My printer is the Ender 3, running Marlin 1.1.9 with a BlTouch and an [aluminium bowden extruder mod](https://www.amazon.co.uk/gp/product/B07DDGGN92/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1)
[![extruder](https://i.sstatic.net/TaeJ3.jpg)](https://i.sstatic.net/TaeJ3.jpg)
(installed after the extrusion problem began).

Any help you can give will be greatly appreciated.

**Tags:** extruder, extrusion, creality-ender-3


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## 1 answers

### Answer by username_1 on 2018-12-13. Score: 2 | Accepted answer

**Mechanical?**

You basically answer your own question that there could be a mechanical issue.

If 93 steps gives you 38 mm, to get to 100 mm, you need to divide 100 by 38 = 2.63 times. This implies that you need 2.63 x 93 = 244.7 steps/mm (not 149.73).

You even tried close to 400 steps per mm to see you are not extruding 100 mm of filament. This implies that you are either missing a lot of steps (increasing the stepper current or increasing the temperature of the hotend would help out) or the extruder gear slips on the filament (increasing the pressure on the extruder gear and filament could solve this).

**Or not mechanical?**

Furthermore, it could be another issue than mechanical. If your extrusion rate is too fast, the stepper might not be able to cope the high speed and miss steps. I have had this before with a too high of a retraction speed.

> **Comments:**
> **username_0**: I sorted the problem, I took the extruder apart and put it back together again (although I don't think this did anything), and I changed the rate that the material is extruded down from 100 to 60 mm/min which I think is the speed the printer normally prints at and I was able to follow your steps and get 100mm of material for a 100mm extrusion command.  

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