Thank you very much for making this great model! I have been looking for something like this (even to buy) to show my kids some sun-moon-earth constellations, and this does the trick just fine.
It might benefit from a few assembly instructions to simplify it further. I am guessing that you glued the base supports to the inside of the base? I would have expected those to just be a little longer, so it is easier to fit them properly. The print file also only contains three supports, where four would be nicer. ;-) Did you also glue the top ring gear to the base? Since it shouldn't move, this makes the entire construction more stable.
In any case, thanks for the time you put into this, it is of great value in my house!