How to know what tension of extruder?  

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atomleef
(@atomleef)
Estimable Member

How to know what tension of extruder? How to test? Please make suggestion. Thank you

Posted : 14/07/2020 5:23 am
jsw
 jsw
(@jsw)
Prominent Member

What do you mean by 'tension of extruder'? Do you mean something like drawbar pull, as in how much the Bondtech gears will pull before slipping?

If so, something like a spring scale would easily measure it.

Posted : 14/07/2020 8:44 am
atomleef
(@atomleef)
Estimable Member

@jsw

sorry for bad english. I mean tension adjustment at extruder gear.

Posted : 14/07/2020 11:55 am
jsw
 jsw
(@jsw)
Prominent Member

No problem.

There are several rules of thumb for setting this, but the bottom line for setting any extruder is the point at which it reliably feeds filament without any clicking or grinding of the filament.  If you read this and other fora, you'll see some who will say that different filaments may require different settings.

Posted : 14/07/2020 5:17 pm
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geoper2
(@geoper2)
Estimable Member

One rule of thumb is what jsw said. You need to pretty much see how well the extruder grabs the filament and feeds it through the line. It needs to be neither tight and making grinding sounds nor loose and making sounds like its freely turning.

Another rule of thumb is to have the tensioner screw flat with the plastic while having no filament inside. This is for filaments like PETG and PLA. For FLEX I found that from the screw being flat to the plastic part you need another 3-4 turns counter clockwise to have good grip with a TPU filament having shore hardness 94A.

 

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Posted : 16/07/2020 1:07 pm
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atomleef
(@atomleef)
Estimable Member

@geoper2

thank you, understood 🙂

Posted : 16/07/2020 1:28 pm
crawlerin
(@crawlerin)
Honorable Member

General rule of thumb is having the screw flush with surface of plastic part. If you unload filament, you can observe fine imprints from extruder gear - not too deep, just tactile enough.

This is one of those things where there's no exact number to be assuigned to it and you have to go by "feels". Same like belt tension or first layer height.

Posted : 16/07/2020 2:43 pm
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atomleef
(@atomleef)
Estimable Member

@crawlerin

thank you 🙂

Posted : 16/07/2020 2:48 pm
OutlawECHO
(@outlawecho)
Active Member

@crawlerin

Hi Crawler. Are you saying markings shown in the image below are expected? If not, do I eliminate these by tightening the tension bolt or loosen?

Thanks again!

Posted : 16/09/2020 10:15 pm
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