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macua85

How to get rid of these lines...

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The horizontal lines aren't due to the 0.2 print layer setting, as these lines appear every few layers. I was wondering if anything mechanical can cause this? Head moves freely, think pulleys are tight. Its not random either, strange. Can try at 0.1, but will be different model as I don't need to print this one again!

Any more ideas?

Also, I find i get neater results at higher PLA temp rather than lower, whats the science behind lower temps?

Thanks for the help

 

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it can be unconsistant extrusion, temperature changes, z wobble or inconsistant filament diameter.. also it can change much by having a fan on 100% or none

i am actually making a longer test to minimize the lines with a little calibration cylinder i made myself

i will post the results in this thread probably next week..

 

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The horizontal lines aren't due to the 0.2 print layer setting, as these lines appear every few layers. I was wondering if anything mechanical can cause this? Head moves freely, think pulleys are tight. Its not random either, strange. Can try at 0.1, but will be different model as I don't need to print this one again!

Any more ideas?

Also, I find i get neater results at higher PLA temp rather than lower, whats the science behind lower temps?

Thanks for the help

 

Speed and temp is related - if you print to hot for you actual speed it will melt ugly and if you print to cold it starts extruding less than it should

but because the movement can generate shaking, slower is often the key with lower temps and it also helps eliminate stringing and oozing

 

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Macua,

We are looking at the exact same issue on the horizontal lines on another thread too.

http://umforum.ultimaker.com/index.php?/topic/6907-horizontal-banding-on-um2/page-4

A good portion of this topic is not so related but the fact that this is very constant match with later reported issue.

For the vertical lines you are seeing the result of the x&y axis precision. We have discussed that here:

http://umforum.ultimaker.com/index.php?/topic/7966-vertical-lines-striations-on-fairphone-case/

Turning the piece sideways to use more of the two axis on an almost planar surface result in reduced effect of the precision.

 

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Thank you :) i will look for a plexi glass plate and test again with some values..

And depending on the results i probably install a full enclosure to install but i'm still not sure if it's a problem with the heat of the stepper motors..

 

Just to give you an idea: I have my UMO in a full enclosure > http://umforum.ultimaker.com/index.php?/topic/9457-umo-enclosure/

The ambient temp inside is about 45C when printing, and this is without a fan to let the hot air out. So i'm wouldn't be too worried about the stepper motors.

 

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