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As mentioned I printed the hinges in Filaflex so I have not used Ninjaflex or the Silicon casting process. However I believe others have used Dragon Skin 30, Silcoflex and Latex with success, although it is not as strong as printed Filaflex. This is due to the fact that a printed hinge has lot of little crack arrestors within the grain of the print, whereas with the cast version, a crack/split once started can quickly propagate through the hinge, causing it to fail.