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Is anyone having trouble with the Spikey 2 shell? I've tried printing it twice and every time I do there's a gap to the right of the head hole that goes all the way to the back (sorry my describing skills aren't the best). I'm not sure if somethings gone wrong with the download (I tried re-downloading and exporting it) or what, but if anyone is having the same problem it would be good to know. Thanks!