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Helix problem
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It's too small and your path needs to be continuous.
Scale up by 10 and weld the path together. and you'll get this.
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no need to weld [although it's better], scale-up does the trick.

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Oh,thank you so much !
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you may also want to give a look at this http://sketchucation.com/forums/viewtopic.php?f=323%26amp;t=51770
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