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PVA doesn't stick!

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This is normal. PLA will stick on top of PVA. But PVA only sticks to PVA. It sounds strange but it's true.

The fix is to use horizontal expansion - it's a feature of cura - it's not working for you for some reason. Try increasing support horizontal expansion to maybe 10mm to see if that makes it so the pva is connected all the way down.

By the way this print doesn't appear to need any support so you could just disable support.

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