Issues with EZStruder

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Amirsf
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Issues with EZStruder

Post by Amirsf »

Hi guys,

Every now and then filament gets stuck in my cold end. This happens randomly, it could be in the beginning of a print, or like today - after 7 hours of printing.
a. I tried tightening the screw holding red handle but that didn't help.
b. I increased the flow rate to %110 and that seemed to help, but not solved the problem altogether.
c. The wheel feeding the filament is aligned properly with the filament.

I attached pictures. Any ideas?

Thanks!
Amir
2015-08-14 10.06.29.jpg

2015-08-14 10.09.45.jpg

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Jimustanguitar
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Re: Issues with EZStruder

Post by Jimustanguitar »

This only happens if there's significant back pressure, what temperature are you extruding at? Too cold, and it may be the cause.

Amirsf
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Re: Issues with EZStruder

Post by Amirsf »

Jimustanguitar wrote:This only happens if there's significant back pressure, what temperature are you extruding at? Too cold, and it may be the cause.


This specifically is PLA printed at 210C with a .5 nozzle.
My first guess was that there is back pressure so I lowered the flow rate to %95 - still no good.

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Jimustanguitar
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Re: Issues with EZStruder

Post by Jimustanguitar »

Try it at 220 or 230.

To know for sure what's going on, set the temp at 180, wait a second, feed the filament by hand, raise it 5 degrees... lather-rinse-repeat until you find the temperature that your particular filament flows the smoothest at.

jjjohnson
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Re: Issues with EZStruder

Post by jjjohnson »

210 should be perfect for PLA. When you loaded the firmware on the RAMBO did you reduce the motor current as directed in the manual on page: 238-239?

The current Automation Technology Stepper Motors, like the Kysan stepper motors require less current which will keep the motors running a bit cooler and prevent issues such as this.
JJ

Amirsf
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Re: Issues with EZStruder

Post by Amirsf »

Thank you all for commenting.
I want to update that this happened today again, when printing in ABS (228C) randomly and then stopped.

I did change the the current settings for the Kysan motors I'm using.
I am now testing printing PLA in lower temperatures and will update how that goes.

If anyone has any other ideas, please share! :)

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Jimustanguitar
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Re: Issues with EZStruder

Post by Jimustanguitar »

You ought to doublecheck the alignment of the drive roller with the filament pathway. Maybe it's off center and not pushing the filament directly.

Amirsf
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Re: Issues with EZStruder

Post by Amirsf »

Hey guys,

I wanted to updated what seems to have fixed the problem for me.
It seems that simply removing the semi-transparent cover from the cold end allows the filament to stay cold enough to prevent it from smudging into the hole.

I left the cover off to allow me to fix it faster, then it stopped happening.

Did any of you print a fan duct for the cold end? Does anyone have a good design to share?

Thanks!

McSlappy
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Re: Issues with EZStruder

Post by McSlappy »

Good call on removing the cover - it's easier without it.

After an hour of printing check the temp of the hobbed gear. It should be warm to touch but NOT hot. I've seen a faulty stepper cause overheating on the hobbed gear and turned the filament soft before even getting into bowden tube. Replacing stepper fixed it right up!
I loved my Rostock so much I now sell them in Oz :)

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