I am constantly having an issue where the infill isn't attaching to the sides of my prints. Front and back are fine, it's only the left and right sides. I thought this may have been an issue with Cura so I switched to Slic3r, the below image is from that print. I guess the alternatives are that there is an issue with my printer. I've calibrated and the dimensions are printing perfectly. Or, it's an issue with the stl files. I'm using sketchup to create the files. Is this something anyone has experienced and if so, how did you resolve it?

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