Is there a limit to how many stars you can grab at once.
no
Unlike the 2015-2016 game, Nothing But Net, there is no limit to how many game objects you can pick up at once. There are actually a few teams that can fit all the field elements on their robots before they flip it over the fence.
Seriously doubt this - How would it even be possible? The game elements are gigantic. Can you provide an example?
8110x
As @Mystical Pie just said, 8110X has done this.
I saw a video where they fit all the elements on their robot. It was most likely probably set up.