[EricH]

I'm with the rest--I don't think removal from the team is the answer. However, I do think there should be some form of negative effect to the individual (that can be turned into a positive effect).

If I were in your shoes, I would start by not allowing the student to volunteer for lead on anything else for this year. But, I would talk to him beforehand and explain that if this were the real world, he'd be out of a job entirely. (At least, without explanation--not that explanation would do much.)

Now, that doesn't mean that he can't be assigned to a task, and hopefully the team leadership assigns tasks that are in the areas he likes. But, the way I'd work it is that if his assigned task (whether it's the website or a robot part or something else) isn't complete by the deadline, he isn't doing anything other than that task at the meetings until it's done!

And, once he's started to show that he can actually hold a realistic deadline, naturally he can get tougher assignments or start volunteering again.