Found 2 3D-models for “moving mechanical arm” across many websites

#stage prop#Armor#costume#Iron Man#cosplay#ironman#gears#mechanical#model to print#assembly
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Iron Man Helmet with mechanical gears for lifting face mask

Iron Man Helmet with mechanical gears for lifting face mask

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Waving Mechanism for Stage Prop, Decoration, Moving Sign, etc.

Waving Mechanism for Stage Prop, Decoration, Moving Sign, etc.

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