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Changes in support placement when upgrading from Cura 2.5 to 2.6

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I've recently updated from Cura 2.5 to 2.6 on one of my machines. I created a specific profile which seems to create the best results from my prints and this hasn't changed. Now, after attempting to prepare a new print I noticed that the new slicing results seemed to use almost twice the quantity of support material as on my machine that wasn't updated to 2.6.

After looking carefully, it seems to me that 2.6 puts support where none is needed and I can't seem to find any way to turn that new behaviour off.

Any help would be much appreciated.

I've included some pictures for reference.

This is the result of the slicing in Cura 2.5:


This is the result of the slicing in Cura 2.6:




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