A windmill blade with a 5mm port designed to attach to Transformers: Earthrise Ironworks. The blades print interlocked into the mechanism, allowing them to spin freely.
An alternate version with G1-accurate bent blades is available here.
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This set includes a sprued 5mm peg-to-peg adapter to allow the blades too be attached to any 5mm peg or port, and also works as a set of helicopter blades for any figure with 5mm connectors.