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leonardo-aguiar

Underextrusion at top left corner of bed

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Posted · Underextrusion at top left corner of bed

Hi guys,

I had a print where one of the corners of the print bed had underextrusion issues. Images are at the flickr link below.

Underextrusion issue

Has this ever happened to anyone? Does someone know what could be the cause of this?

Thanks.

Best regards.

Leo

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Posted · Underextrusion at top left corner of bed

My guess would be higher friction in the bowden due to the more extreme curve on that position. It's basically why I made this;

https://www.youmagine.com/designs/ultimaker2-rail-system-u2rs

though this should probably not be necessary with a good feeder....

 

Nevertheless, using a PTFE Bowden tube 8-12" longer than OEM will reduce friction considerably.

Here's the stuff you want: http://www.amazon.com/gp/product/B00KJDE67G Also comes in 10" length.

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Posted · Underextrusion at top left corner of bed

 

My guess would be higher friction in the bowden due to the more extreme curve on that position. It's basically why I made this;

https://www.youmagine.com/designs/ultimaker2-rail-system-u2rs

though this should probably not be necessary with a good feeder....

 

Nevertheless, using a PTFE Bowden tube 8-12" longer than OEM will reduce friction considerably.

Here's the stuff you want: http://www.amazon.com/gp/product/B00KJDE67G  Also comes in 10" length.

 

Some measured numbers for this reduced friction would be interesting. Are you referring to total friction or friction per length?

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Posted · Underextrusion at top left corner of bed

Total friction. You won't need numbers if you try it out - the difference is immediately obvious if you disengage the feeder drive cog and slide the filament into the tubing - much less friction.

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