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(safe (has it got any sharp corners, can water get in it and start a fire,…
( safe (has it got any sharp corners, can water get in it and start a fire, is it flamable), circuit (how long will it take to make, what will power it, what components i will need to make it), size (is it easy to travel with, is it small enough to be a choking hazard for little children), custormer (what age are they, what gender are they), function (how it works, how long will it time for), cost (how much will it cost to make), aesthetics (colours))