a small ammount routing I believe is ok (ive done it recently) to fit 12s4p 21700 cells (40T). I followed @donta42 ’ s build thread, where he shows how to do it. He uses a router, but i know others who have used a dremel and it’s been fine too. I used a router and i would advise practicing on some scrap wood first, those things are scary powerful.
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