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I have the same issue. I suspect it's an issue with slic3r, and I'm not going to worry too much about it because it's still in development. Note that the pictures of successful prints show that the spokes are at least two extrusions wide. Right now Slic3r is trying to print mine one wide, which is apparently not enough, although in theory if I had my machine dialed in it would be ok. Either way, adjust your software settings until the software makes the spokes 2 wide.