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The one with the gear integrated into the arm? I had wondered about that. I've only printed in ABS, I hear PLA is a little bit brittle? Also did you have any problems printing the arm? I had a weird error printing one with some runnoff lines. I found some internal geometry and deleted it. Going to try it again tomorrow. Now that I am back in AK I can concentrate on finishing this project. Thanks as always for beta testing :)