I am 3D printing cookie cutters and using Tinkercad to create the printing lines.  I'm importing the line art into Tinkercad from Illustrator, then importing the Tinkercad stl into Cura for Ultimaker.  Some of the prints come out perfectly.  But on some designs there is a lot of stringing and/or gaps in the lines.  Does anyone know why this happens? 

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