Extruder skips mid print randomly/Infill pattern problem

Saltlife716

So should I save the M303 results even thou it says something about 400c?

Saltlife716

And how about the bowden path? If you feed it by hand, do you find any resistance?
I once had a filament that was just a bit thicker and it got stuck inside the bowden tube.

Nah no resistance when I push it through. The tube itself is maybe 2 weeks old.

Saltlife716

I have checked and calibrated extruder steps and current.
I swapped stepper drivers.
I changed stepper motor wiring.

About to put it my previous hotend and see if I get the same issue…

Saltlife716

@BDubs:

What happens when you jack the current up to like 1.2 or 1.4A ?

Going from 800 to 850 is like nothing…50mA is nothing to these motors.

When i bring it to 1.4A, it acts the same.

Saltlife716

I put my previous E3D v6 on the printer, and the same happens

Saltlife716

Extruding 10mm of filament at 5mm/sec, skips the entire time

Trojan3D

Hi Saltlife,
From what I can see, the temperature is one of the issues, so you should just raise up to 220 degrees minimum if not 230!
Your extruder is fine printing the skirt because S3D give usually less plastic during the process.
The temperatures reading change every time from a board to another, it doesn't mean that Duet is wrong, you should try to point an IR probe to the heater and see what is really going on near the nozzle.
Your extruder shouldn't skip steps as in the video, should grind the filament instead, so, I would raise the current to a decent amount and then step back until the motor is running fairly warm if you don't know the motor technical details.
The motor is not retracting, is just the effect of the stall, the filament act as a spring as your is a Bowden and the pressure is just doing that because the moment your motor stall, the rotor has no more torque and become loose.

My 2 cents
Regards

Saltlife716

@Trojan3D:

Hi Saltlife,
From what I can see, the temperature is one of the issues, so you should just raise up to 220 degrees minimum if not 230!
Your extruder is fine printing the skirt because S3D give usually less plastic during the process.
The temperatures reading change every time from a board to another, it doesn't mean that Duet is wrong, you should try to point an IR probe to the heater and see what is really going on near the nozzle.
Your extruder shouldn't skip steps as in the video, should grind the filament instead, so, I would raise the current to a decent amount and then step back until the motor is running fairly warm if you don't know the motor technical details.
The motor is not retracting, is just the effect of the stall, the filament act as a spring as your is a Bowden and the pressure is just doing that because the moment your motor stall, the rotor has no more torque and become loose.

My 2 cents
Regards

I will try raising the temp to 220 when I get home and see if that works. Thanks.

T3P3Tony

@Saltlife716:

So should I save the M303 results even thou it says something about 400c?

Just to clarify this message means that if the heater cartridge is allowed to draw full power, with no control, it could reach about 440C. This is not a configured parameter its a warning generated to make you aware that the max temperature if the control fails could get to a dangerous level. This is not control electronics specific but dependent on the heater cartridge, your power supply voltage, and the cooling rate of the heatblock (which is changed by having a silicone sock on it).

So yes you should save the results using M303, and also be aware that an electronics failure could lead to a very hot hotend!

dc42

Actually 440C is not nearly as hot as I sometimes hear reported, in particular nowhere near hot enough to melt the aluminium.

Saltlife716

Ok I'll redo the PID test and save it then. But guys.. Listen to this. Trojan3D was on point with the hotend temp…

I ended up buying a brand new spool of Hatchbox filament, loaded it up, set temp to 200c. It worked PERFECTLY... Put in the old filament at 200c, then I got the same problem, brought the temp up to 220, and it started printing perfectly...

So my problem was, for some reason, this PLA (and other PLA of same brand) needed to be at 220c in order to print correctly..

Saltlife716

And yes all of my filament rolls are in individual 2 gallon ziplocs bags with the "keep dry" packs in them.

Trojan3D

Heiii,
Glad it worked at the end,
So all good, that´s what matter!!
Regards
Emanuel

PS. how can i post some pictures here?
thanks

dc42

To post pictures, host them on a public file sharing site and place the URL between img tags. If hosting them on Dropbox, replace "?dl=0" at the end of the URL by "?raw=1".

Trojan3D

Thank you very much!!
Cheers