In my experience, gears need about 0.2mm clearance compared to the model. But yours look a lot bigger then that. The single outer border works very good for gears, so that is good.
It's a bit hard to judge without your model and knowing which software you are using. Got some more info?
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c-ernst 1
Is the height correct? It looks like it's over extruding or the z is half what it should be.
What slicer are you using?
Have you had any other successful prints?
Chuck
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