<p>I own two Ender3 printers, a stock one and one upgraded with SKR mini E3 v1.2 and BMG clone.</p>
<p>I calibrated the E-steps using the filament measurement method ~415 looks correct.</p>
<p>The machine severely over extrudes, reducing the flow rate to ~50 % looks right. I would say it pushes out about twice as much material then it should.</p>
<p>I am testing this using a simple one walled cube, sliced with Cura 4.7.1.</p>
<p>Printing this will have the wall thickens about double and several blobbing on the side the layers are restarted.</p>
<p>Printing the same G-code on the stock printer works without problems.</p>
<p>Printing from the card or using Repetier Server does not make any difference.</p>

CC BY-SA 4.0
2020-11-02T17:40:19.700Z
415 is *not* correct, so much I can tell from my config. My Ener3 has: `#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 93 }`
Trish
CC BY-SA 4.0
2020-11-02T18:31:21.007Z
93 is for the direct original extruder
sanyi
CC BY-SA 4.0
2020-11-02T18:59:42.407Z
the original *bowden* extruder. Direct is where the motor is on the carriage.
Trish
CC BY-SA 4.0
2020-11-02T20:00:11.553Z
correct, i expressed wrongly, I meant "not geared" as the Bondtech BMG extruder it is, such extruder has a gear reduction, hence the bigger E-steps needed
sanyi
CC BY-SA 4.0
2020-11-02T20:03:34.810Z
Ok, you always should *calculate* the steps for the extruder. Can you give us numbers for the gear ratio?
Trish
CC BY-SA 4.0
2020-11-03T06:32:43.107Z
415 should be pretty close. My BMG clone runs at 407 (with 16x microstepping and 1.8° stepper motors).
93 is *obviously* for the stock extruder, which the asker replaced.

Make sure you have no flow rate modifiers active with `M221 S100`
towe
CC BY-SA 4.0
2020-11-03T08:02:14.587Z
At how many microsteps have you set the TMC2209? Default should be `#define E0_MICROSTEPS    16` as seen in the Configuration_adv.h.
0scar
CC BY-SA 4.0
2020-11-03T17:54:18.210Z
I actually forgot about checking micro steps and really hoped this is, but turned out where 16. M221 returns `echo:E0 Flow: 100%` . I will now try to print the models from "Teaching Tech 3D Printer Calibration". Thank you a lot for all the good tips.
sanyi
<creality-ender-3><skr-mini-e3>
Over extrusion on Ender 3 with SKR mini E3 v1.2 and BMG clone (Bowden)
sanyi
# Over extrusion on Ender 3 with SKR mini E3 v1.2 and BMG clone (Bowden)

(Asked by: username_0 on 2020-11-02)

I own two Ender3 printers, a stock one and one upgraded with SKR mini E3 v1.2 and BMG clone.

I calibrated the E-steps using the filament measurement method ~415 looks correct.

The machine severely over extrudes, reducing the flow rate to ~50 % looks right. I would say it pushes out about twice as much material then it should.

I am testing this using a simple one walled cube, sliced with Cura 4.7.1.

Printing this will have the wall thickens about double and several blobbing on the side the layers are restarted.

Printing the same G-code on the stock printer works without problems.

Printing from the card or using Repetier Server does not make any difference.

**Tags:** creality-ender-3, skr-mini-e3

> **Comments:**
> **username_1**: 415 is *not* correct, so much I can tell from my config. My Ener3 has: `#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 93 }`  
> **username_0**: 93 is for the direct original extruder  
> **username_1**: the original *bowden* extruder. Direct is where the motor is on the carriage.  
> **username_0**: correct, i expressed wrongly, I meant "not geared" as the Bondtech BMG extruder it is, such extruder has a gear reduction, hence the bigger E-steps needed  
> **username_1**: Ok, you always should *calculate* the steps for the extruder. Can you give us numbers for the gear ratio?  
> **username_2**: 415 should be pretty close. My BMG clone runs at 407 (with 16x microstepping and 1.8° stepper motors). 93 is *obviously* for the stock extruder, which the asker replaced.  Make sure you have no flow rate modifiers active with `M221 S100`  
> **username_3**: At how many microsteps have you set the TMC2209? Default should be `#define E0_MICROSTEPS    16` as seen in the Configuration_adv.h.  
> **username_0**: I actually forgot about checking micro steps and really hoped this is, but turned out where 16. M221 returns `echo:E0 Flow: 100%` . I will now try to print the models from "Teaching Tech 3D Printer Calibration". Thank you a lot for all the good tips.  

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## 0 answers

