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imho that design has a big issue... the external sphere, which needs to be "free to turn", is firmly stuck to the bottom layers, with no brittle parts. If you print hard solid, you will never be able to unstuck it, and this will result either to a "non working thing" or a "broken thing".
This design needs to have holes and bridges to make the external sphere "easy to unstuck"...
the other parts are wonderfull