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I am almost done with printing this. I started with Dragons original but than found this. so I have a mismatch of both. I printed the handle and grips from the original. I don't think you would be able to do that in ninja flex anyway. The only flat spot on either are the very top or bottom of the grip.
Not I have not printed in any flexible materials so I am not expert. I just don't think a tall kind of thin part would work well in a flexible material