"Fluffy" Prints

[UALib3D 2]

Does anyone know why I am getting this weird effect on my prints? I am using the exact same settings, and same print on a different ultimaker 3 and am not having this issue. It seems like the only thing that could be the issue is something with the printer itself. I've done almost every calibration, bed level, swapped printcores, checked to see if the fans are working. The temp was at 200 C for PLA which is what I use for the other U3 printers. It looks almost like the PLA "rises" and then the nozzle pushes it down, and squishes it over and over. It just looks fluffy. Again, I have the same exact cura settings on another U3 and it comes out perfectly fine. 

[gr5 2,172]

Does the other printer have white filament?  White is worse.  Raised edges over overhangs are common but this is extreme.  Check the fans.  Fans and cooler temps improve this.

[UALib3D 2]

The other will print white fine, and the fans are working. It seems like the only issue is the X direction.

[UALib3D 2]

On 10/28/2021 at 6:37 PM, gr5 said:

Does the other printer have white filament?  White is worse.  Raised edges over overhangs are common but this is extreme.  Check the fans.  Fans and cooler temps improve this.

The other will print white fine, and the fans are working. It seems like the only issue is the X direction.

[kayakbabe 12]

Did you try using the print core from the printer that is working well in the printer that is having issues?

 

That would eliminate the print core being an issue. 

 

Also check your fan, make sure there aren't any itsy bitsy fine filament goodies wound around it's axle. It does look like it's too hot. 

Edited November 1, 2021 by kayakbabe

[UALib3D 2]

14 minutes ago, kayakbabe said:

Did you try using the print core from the printer that is working well in the printer that is having issues?

 

That would eliminate the print core being an issue. 

 

Also check your fan, make sure there aren't any itsy bitsy fine filament goodies wound around it's axle. It does look like it's too hot. 

Yea, I swapped printcores, still had the same issue. The belt tension seems to be fine as well. also no play in the axels. The fans all appear to be working. Im wondering if there is a faulty thermistor or something. Although I think the thermistor is apart of the printcore, so that would not make much sense either. 

[Torgeir 242]

On 10/28/2021 at 11:35 PM, UALib3D said:

Does anyone know why I am getting this weird effect on my prints? I am using the exact same settings, and same print on a different ultimaker 3 and am not having this issue. It seems like the only thing that could be the issue is something with the printer itself. I've done almost every calibration, bed level, swapped printcores, checked to see if the fans are working. The temp was at 200 C for PLA which is what I use for the other U3 printers. It looks almost like the PLA "rises" and then the nozzle pushes it down, and squishes it over and over. It just looks fluffy. Again, I have the same exact cura settings on another U3 and it comes out perfectly fine. 

Hi @UALib3D

 

You've already got good advice from @gr5 here, -so I'll just add something more..

 

This is quite interesting, first I noticed the brownish color on the front (inlet side of cooling fan) that tell a story?

This color indicate high temperature, a black debris just in front of the printed object and finally the nozzle in the middle of the print.  All this indicate too high temperature to me. How does your print head look from below?

 

So, -inside the head there is a control PCB (printed circuit board)and this board also include the precision amplifiers for both print cores.

Say that no1 print core amplifier by some reason say that the temperature is to low, then the control circuit will increase the temperature as high the error signal tell.

If this is the problem, it would not help to change (swap) the print cores.

You may also use an infra red temperature sensor in order to check if the temperature is correct.

 

A better close up of "all" sides of your model may give more info about the problem.

Also try to turn the model 45 deg to see how this work..

 

Good Luck

 

Thanks

Torgeir

 

 

[gr5 2,172]

Woah - something is definitely seriously wrong.  There are 3 fans in the print head.  Did you make sure the 2 side fans are working?  Maybe put a piece of paper in the flow.

 

I'm suspecting the nozzle temp.  Try printing from the right slot instead of the left.  If something is wrong with the contacts to the core or if something on the head PCB (an amplifier circuit) then likely it will only be a problem on the left head.

 

Also you can check the temperature using this quick video.  It's a rough check but certainly accurate enough to hopefully confirm if your nozzle is 20C too hot:

https://www.youtube.com/watch?v=mrZbX-SfftU

 

[UALib3D 2]

19 hours ago, Torgeir said:

Hi @UALib3D

 

You've already got good advice from @gr5 here, -so I'll just add something more..

 

This is quite interesting, first I noticed the brownish color on the front (inlet side of cooling fan) that tell a story?

This color indicate high temperature, a black debris just in front of the printed object and finally the nozzle in the middle of the print.  All this indicate too high temperature to me. How does your print head look from below?

 

So, -inside the head there is a control PCB (printed circuit board)and this board also include the precision amplifiers for both print cores.

Say that no1 print core amplifier by some reason say that the temperature is to low, then the control circuit will increase the temperature as high the error signal tell.

If this is the problem, it would not help to change (swap) the print cores.

You may also use an infra red temperature sensor in order to check if the temperature is correct.

 

A better close up of "all" sides of your model may give more info about the problem.

Also try to turn the model 45 deg to see how this work..

 

Good Luck

 

Thanks

Torgeir

 

 

Mystery Solved, Once I read that the PCB behind the cores control temp I looked at it and the middle pin was bent down. The hotend was just getting as hot as it wanted. Bent the pin back in place and the print is looking great!