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How to print a closed tube offset with full PVA support

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I got my UM3 Extended just some weeks ago and I`m still struggling with radii and this big tube.

I have tried to print this part with PVA support but the surface between the first layers of the PLA print look really ugly because

of the mixture of these two materials and the radii around (picture).

 

Is it possible to print the first layers with pure PVA support and then print the PLA? If I turn the part 180°, I have a big loss of the PVA.

What about a Z off-set? Does it work? How to insert it? I have already installed the plugin but I could not find the correct window....

 

Is there a general solution? If you print a ball there must be the same issue.

 

Thank you in advance for any weekend saving advice ?

 

Best regards,

Thorsten

Bildschirmfoto 2018-10-12 um 22.48.34.png

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