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Z artifact after hole

Posted: Thu Aug 08, 2019 8:31 am
by ATF300
I'm looking for an explanation for extrusion artifact i get on the z-axis

Image

my first thought was dirty z screws, but it all happens around hole prints.

the printer in question is a cr10s with the bondtech direct drive system. material is PLA.

any help or pointers is greatly appreciated, thank you !