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Hello Drew, Thanks for pointing out the issue at the file. I hope it didn't cause a big problem in your overall trumpet printing job.
I did an extensive checking on solidworks in detailed section view and also saw the issue. As of 2/9/2015 I've corrected it and removed the faulty file, uploaded a Version 2.0 lid file. It lacks the ridges you've clipped.
Wish you happy printing and thanks for the feedback.