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Although my personal prints came out perfectly with open windows, Shapeways still refuses to print them because they had thin window bars. So to fix them, instead of making them thick, I decided to fill in the windows. You now have the option of carefully cutting them open or using them as they are. I'm considering buying a quantity with open windows to sell in my ebay store: http://stores.ebay.com/willmodels Please contact me at: firstname.lastname@example.org if you are interested.