Elegoo Industries (https://www.elegoo.com/) is a great company for open ended projects. It's based off the popular Arduinio Microcontroller. I love it because it has the raw feeling of the electrical components, but it's also easy to setup so there's little to no intimidation. Even better, all the parts could be used in other workshops or creations.
These kits do require the student to learn to code, but YouTube has tons of examples. In the future I might make a few my own with the kit I have. You will also be challenged with the open ended projects because concepts like voltage and current can prevent the project from working like planned. It's a great way to learn the process of debugging and problem solving, but just be aware that there might be times you're just as stumped as your child trying to make a robot that's never been made before.
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