Mirroring model across a plane

is there a CFrame transformation that can accomplish this?

Perfectly, no, since things like MeshParts technically won’t flip without inverting their mesh. But in terms of wedges, normal parts, you can make something that appears mirrored by inverting two of the rotation vectors, and mirroring the position across the axis you want to mirror. For parts that have an axis of symmetry, this method should work fine for you.

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