Interlocking cubes

Update: I had another go at finding that original photo, and I think it was the one that appears with Richard Gain's ducted fan for Mendel90: https://pinshape.com/items/4488-3d-printed-low-profile-ducted-fan-for-mendel90-with-e3dv4-hot-end

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I saw this design in a random photo (which of course I can't find again), but couldn't find an stl for it. It looked like an interesting thing to print so I created a model in OnShape:

https://cad.onshape.com/documents/62fc907018bdbbb