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super-grover

Im not quite sure why i am now getting bad quality prints

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I need help trying to figure out why I am getting such a bad quality print...

 

Underextrusion. That's what you need to type in the search box above. You are not alone... You may have a problem with the feeder; you might be using too low temperature or too high speed; your Teflon isolator might be deformed; your Ultimaker blue filament might be to blame.

 

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Yes, underextrusion. What speed/temp/layer height did you use? Here is the limit a UM2 can do:

http://umforum.ultimaker.com/index.php?/topic/4127-um2-extrusion-rates-revisited/

Here is a good test. If you run this test it MUST be at 230C for any kind of valid comparison:

http://umforum.ultimaker.com/index.php?/topic/4586-can-your-um2-printer-achieve-10mm3s-test-it-here/

 

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When printing, does your material feeder seem to rotate normally - and does the filament move smoothly? Or, does it look like the feeder's wheel slips backward every now and then?

Have you tried cleaning the nozzle using the so-called "Atomic method"? (https://www.ultimaker.com/spree/uploads/113/original/Ultimaker_2_Atomic_Method.pdf)

 

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hi

please help

the lines on the flat surface are very thin (but the first layer is OK)

DSCF4846a

 

i've done the under extrusion test (the result is perfect)

DSCF4849

this problem started at cura 14.03 , so my first question is how to download and install firmware for cura 14.01

or any other solution for this problem?

thanx

András

 

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Andras you definitely have underextrusion. I see two things that prove it - your top layers have holes in them and your shell paths aren't touching (gaps in shell).

Try printing at 240C and at 30mm/sec just to see how much this improves things.

With the UM2 there are 2 types of underextrusion. The first type (tested with the cylinder) is when the pressure is to strong for the feeder motor and it skips backwards. In that case you get an area with zero extrusion. You have the second type where the motor is fine but the filament is slipping in the feeder. You might want to try tightening the feeder but I'm not sure that will help. Anyway the cylinder test doesn't show the second type at all.

Instead just try printing a bit hotter and a lot slower just to see how it *should* work. Then you can gradually speed it up until you get to a speed that you think is reasonable.

Also keep in mind that different colors of PLA have different viscosity at a given temperature. Also other factors can create underextrusion for example if your filament is tangled or if it's bent at a strong angle. Consider putting the filament on the floor. Also if you are near the end of the spool of filament the curvature is often too strong for the isolator.

Printing much slower should overcome all of these issues.

 

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