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Ultimaker 2 Breathable Electronics Enclosure
I wanted an enclosure for the UM2 that allowed the electronics to breathe more.
I had a hard time getting this to work. At first I tried to put all of the holes in the bottom face in the part model. But all those little perimeters made it difficult to print.
So I made the bottom side of the enclosure solid in the model.
In the slicer software (S3D), I set the number of top and bottom layers both to zero. And I set the number of shells to 10.
It didn't print perfect, but it printed better than any of my previous attempts.