SPI resin identification code 7 (include PLA, Nylon and others)

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[Spi Resin Identification Code](Http://En.Wikipedia.Org/Wiki/Resin_Identification_Code) 7 To Be Incorporated On Objects Surface Before Printing To Identify The Material. I Plan On Adding A Version With "Pla" Under The Arrows To Precisely Identify The Type Of Plastic.

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