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...but they work for me and hundreds of others who have downloaded this file. The bottom line is not all slicing aps and 3D printers are the same. A precise slicing app and well set up machine printing PLA and with a filament fan should print this fine. I've personally printed over 200 of these (for a business marketing activity) on our MakerBot's with no issues.

If I could suggest anything to help I would but all I can say is you need to look at your slicer settings and/or machines setup / capabilities.