I have the rubber feet on it, but I feel like it might need more cooling for the sake of longevity of the overall build. I was thinking of adding the speedball to it this week until problems started appearing. I think I was given the 240v transformer, I mean I wired it the way I was meant to for 240 mains. As mentioned, it has worked for 2 weeks or so before problems came to be, as such, it had passed all of the voltage and resistance checks.