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Extruder Suddenly Doesn't Run

Posted by Shachar85 
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Shachar85
Extruder Suddenly Doesn't Run
July 03, 2016 03:15AM
Hi

Strange malfunction. Extruder motor stopped working.

Switched between X axis motor and extruder - Result: extruder works and X axis dosn't.
I figured maybe driver is gone.
Switched between drivers - extruder still doesn't work.

So... motor is ok. driver...probably ok.
Settings? (I didn't touch them. shouldn't be a problem)
Ramps? maybe. I find it a bit hard to believe.

Any more ideas?
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Shachar85
Re: Extruder Suddenly Doesn't Run
July 03, 2016 12:45PM
changed RAMPS
same result

changed driver again for double check. same results

Real frustrating. any ideas guys?
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o_lampe
Re: Extruder Suddenly Doesn't Run
July 03, 2016 01:01PM
Prevent cold extrusion enabled?
Heater element or cable broken?

Edited 1 time(s). Last edit at 07/03/2016 01:03PM by o_lampe.
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Shachar85
Re: Extruder Suddenly Doesn't Run
July 04, 2016 07:19AM
heater element doesn't play part. the motor doesn't run even with no filament.
the cable should be fine as the motor worked every time I switched with X axis.

What is prevent cold extrusion? sounds like it could be something
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o_lampe
Re: Extruder Suddenly Doesn't Run
July 04, 2016 10:28AM
The firmware only allows the exrtruder to move, when a certain temperature is reached. ( eg. 175°C )
See M302 for more details.
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Shachar85
Re: Extruder Suddenly Doesn't Run
July 04, 2016 01:59PM
GREAT
That's it. Thanks!
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Shachar85
Re: Extruder Suddenly Doesn't Run
July 04, 2016 02:24PM
ok...it wasn't the main problem

The problem was the gear was not tight enough on the motor
The motor DID turn. I just didn't see it (because I was looking on the gear)
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Shachar85
Re: Extruder Suddenly Doesn't Run
July 10, 2016 02:00AM
It seems that the problem became more complex than I thought.
I couldn't understand why the problem repeated even when I tighten the screw.

I found out the extruder motor became so hot that the small gear (greg wade reloaded) twisted after few minutes.
I found it interesting. I'm trying to print an ABS gear. mine is PLA. Hoping it will solve the problem

Though I reall don't thing the motor should heat so bad...
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o_lampe
Re: Extruder Suddenly Doesn't Run
July 10, 2016 03:27AM
You've changed the drivers a lot. Did you also adjust the Vref on the drivers? Maybe they get too hot and switch into overtemp protection mode?
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Shachar85
Re: Extruder Suddenly Doesn't Run
July 10, 2016 06:25AM
I didn't touch the Vref at all.
I don't think the get in overtemp protection as the motor continue to spin (if I understand correctly that overtemp is when the driver shut the motor until it cools).

There's a small fan pointed on the the drivers making it possible to run.
The motors still get very very hot. Impossible to hold by hand.
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frankvdh
Re: Extruder Suddenly Doesn't Run
July 10, 2016 06:46PM
Very very hot is bad. The motor should get warm, not hot. I suggest turning down the current to the motor.

If that results in jams or skipping or other issues, you need to address those... don't turn the motor current up too far.
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