Filament Tension Adjustment  

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rlauffer
(@rlauffer)
Active Member

I'm having a terrible time adjusting the tension on my i3mk3s       I'm using hatch box pla at 215 nozzle and 40 bed

no matter how much or little I adjust the setscrew, it won't properly feed the filament 

I need assistance on the proper procedure to set it so my filament flows

I've changed the nozzle   My printer is a month old

Maybe I'm too old !

HELP !!

Russell Lauffer...
Posted : 30/09/2020 10:17 pm
joan.t
(@joantabb)
Veteran Member Moderator

Hi Russell, 
I am 65... is that old enough? 

without filament in the extruder, I loosen the tension screw until there is no tension on the screw, then I tighten the screw until I just feel the tension cause the screw to be a tiny bit tougher to turn, and leave it at that. 
I then load the filament and print to my hearts content. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 30/09/2020 11:57 pm
jsw
 jsw
(@jsw)
Prominent Member

I use Hatchbox PLA, PETg, and ABS all the time.  I've found that the 'sweet spot' for tension is with the head of the screw just slightly below the surface of the extruder.  It's pretty much a set-and-forget adjustment once it's dialed in.  I find that it rarely, if ever, needs to be adjusted for such things as filament brand and type.

And don't worry about age!  I'm older than Joan.  I'm retired and use 3d printing mostly for model railroading.

Posted : 01/10/2020 2:50 am
Area51
(@area51)
Honorable Member

Printing PETG I have the tension screw at the same level as @jsw. I agree it is set and forget until I use TPU/Flex, here I loosen two turns to avoid squeezing the filament.

Have a look at my designs on Thingiverse or on PrusaPrinters ;)...
Posted : 01/10/2020 4:03 pm
charles.h13
(@charles-h13)
Famed Member

@jsw

I have the same setting.  

This post was modified 3 weeks ago by charles.h13
Posted : 01/10/2020 4:46 pm
rlauffer
(@rlauffer)
Active Member

Well I'm 75 

I've tried all the methods that I received,  none work.  If I apply manual downward pressure on the filament it comes out fine.

What else could I be missing ?

Open to all suggestions - I just ordered a new spring   but I don't know the size of the screw.

 

Russell Lauffer...
Posted : 01/10/2020 5:25 pm
Area51
(@area51)
Honorable Member
Posted by: @rlauffer

Open to all suggestions - I just ordered a new spring   but I don't know the size of the screw.

The screw used to adjust and hold the spring is M3x40 mm (ISO DIN 4762).

Have a look at my designs on Thingiverse or on PrusaPrinters ;)...
Posted : 01/10/2020 11:30 pm
joan.t
(@joantabb)
Veteran Member Moderator

@rlauffer

Hi Russel, 

Is the grub screw fitted in the Motor side of the bondtech pair? 
it should be M3x2   and  should befitted against the flat on the motor shaft. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 01/10/2020 11:31 pm
rlauffer
(@rlauffer)
Active Member

GOT IT

the screw on the tension sprocket was a little loose  -  tightened it and all in ok in the world  except for:::::

did a full calibration and now the Z (set to zero) is still to low 

how do I raise it ??

Russell Lauffer...
Posted : 02/10/2020 6:33 pm
joan.t
(@joantabb)
Veteran Member Moderator

if there is a gap between the nozzle and the build plate. Adjusting the live Z to a negative value will reduce the size of the gap.

 

The printer will not go into positive values

Regards joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 02/10/2020 7:29 pm
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