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I was printing around 100mm/s (normal speed for the craftbot) 0.2 is medium quality .. I sliced with (old) CURA 15.02.1

I did a little bit of sanding around the bottom and left side of the button .. just a bit, my case might have a slight warp since it had been empty in storage for a while so it could be the case and not the design (it could also be a little due to the overhang/support I used as well) .. once sanded a bit it fit just fine.