Differential Gear brick
thingiverse
In the 1980s, a leading brick manufacturer pioneered this unique differential housing design. Note that the accompanying Lego bricks are recreations based on available photographs, and may contain inaccuracies. To achieve optimal layer orientation, you can print the housing in two separate parts. Then, secure the pieces together using super glue for a strong bond. (Updated April 28, 2018)
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