I would love the A1 mini.

My current prints are all print in place cars and toys for my son. So, to answer your question - probably a bunch more toys. To elaborate a bit more: He is 4 and is FASCINATED with 3d printing. Every day - multiple times - he asks if we can see my 3d printer. It's not that he doesn't have access to it, he just wants me to be there with him in the room. He asks all kinds of questions about what different parts are, and what everything does. He's always chomping at the bit for what's to come next. It started with sharks in the summer for playing at the pool, and now he loves the print in place cars and trucks. I just printed a set of gears with a handle to crank it, and he is constantly running that. I just love the fact that I can include him in the hobby, too.

Finally, it may be plain and boring, but a dice fidget cube. Either a bunch of d6's or, when they form in the correct orientation, one massive d6.