Geetech mk8 extruder marlin settings

[Jason Markham]

Hi 

Just assembled my second printer. i am using the geetech mk8 extruder with ramps 1.4 using drv 8825 drivers set at 1.32 step. 

i calibrated the x , y z axis so far and now i need to calibrate the z axis - so far i can print with low quality  with extruder setting at 294. 

can anyone share his values with similar setup . 

thanks 

[Iceflow]

You mean you need to calibrate the E steps, dont you? the extruder...

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[Javier Collado (fuseprods)]

Please, read our nettiquetes.

E steps per mm = 186 for last Geeetech mk8 extruder with 1/32 microstepping.

Vref deppends on the Rsense value of your DRV8825.

El martes, 1 de septiembre de 2015, 1:25:22 (UTC+2), Aisflou escribió:

You mean you need to calibrate the E steps, dont you? the extruder...

2015-08-30 21:57 GMT+02:00 Jason Markham <jmcs...@gmail.com>:

Hi 

Just assembled my second printer. i am using the geetech mk8 extruder with ramps 1.4 using drv 8825 drivers set at 1.32 step. 

i calibrated the x , y z axis so far and now i need to calibrate the z axis - so far i can print with low quality  with extruder setting at 294. 

can anyone share his values with similar setup . 

thanks 

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Para anular la suscripción a este grupo y dejar de recibir sus mensajes, envía un correo electrónico a asrob-uc3m-impresoras-3d+unsub...@googlegroups.com.

[VincentM]

I think it will be a value near 291 steps/mm.

In the Geeetech wiki page: http://www.geeetech.com/wiki/index.php/MK8_Extruder
We can see:
Motors: 1.8° (200 steps/turn)
MK8 drive gear effective diameter: 7mm

So:

(200 steps/turn * 32 microsteps) / (7 * pi) = 291.26

[Javier Collado (fuseprods)]

Try VicentM first (it is supposed to be the good one). If that's not working, try with mine. I don't know why, but last batch we ordered has a different step/mm settings that we had to recallibrate.

[Jason Markham]

Hi all 

I re calibrated the extruder  steps and came out as 227 according to my calcs

#define DEFAULT_AXIS_STEPS_PER_UNIT   {160.0, 160.0,8000.0, 227.0} 

i then used mecreator values in repetier/ slicer to get things going smooth // i can print the test cube with awesome quality . 

should i raise the extruder steps to 290 ? 

thanks 

On Wednesday, September 2, 2015 at 5:56:58 PM UTC+2, Javier Collado (fuseprods) wrote:

Try VicentM first (it is supposed to be the good one). If that's not working, try with mine. I don't know why, but last batch we ordered has a different step/mm settings that we had to recallibrate.

On Wednesday, September 2, 2015, 17:02:56 (UTC + 2), VincentM wrote:

I think it will be a value near 291 steps/mm.In the Geeetech wiki page: http://www.geeetech.com/wiki/index.php/MK8_ExtruderWe can see:Motors: 1.8° (200 steps/turn)MK8 drive gear effective diameter: 7mmSo:(200 steps/turn * 32 microsteps) / (7 * pi) = 291.26

[VincentM]

No.
Let it as you calculate, if you are printing well.
From theory to real work .. :D

[VincentM]

world, not work

[Jason Markham]

hi 

after several prints i started to notice that the objects created were over extruder so i dig deeper and discovered that my drive gear is 11mm not 7 mm ,  i have the brass one on my mk8 

so  200 x 32 = 64 000 / 11 *pi = 34.5575 = 185.198 

[Brad Stansell]

And we thought we'd never use any of that elementary school math in the real world.