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Hey there and thanks for reaching out. I literally just received the email notification for this message. Anyway, assuming you are having difficulty with the lower arms, I amended the design slightly so the bases of the inner arms are lower so should be more stable on the base of the outer arms shells. The amended STL files are named ArmLeftPart1(amended) and ArmRightPart1(Amended). This should help with the problems you have been having. Let me know if this helps. :-)