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ABS top edge lifting

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I finally finished the UM2 enclosure and started doing some prints in ABS. However, one of the first prints failed with one of the top edges lifting up. Photo included.

Every other edge is fine. The big central hole has been printed with supports but it is far enough not to affect the bad corner.

IMG 20150321 232702

edit: talking about top left corner lifting up in the first image

IMG 20150321 233131


Any hints what may have happened there?

Printed at 260 C, bed at 110 C, ambient inside enclosure about 50 C, no fan.



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Maybe I am wrong but it looks like the plastic did not cool enough. Maybe at a little bit of fan. I usually add a bit of fan for ABS. Lets say 20% or something like that depends at what setting your fans start turning.


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