Fired it up for the first time and whilst nothing exploded(good) I did only have it on for about 5 seconds as the stepper motors were making an odd noise. Hard to describe it really but I'll have a go - the noise was a rising pitch kinda like a kettle coming to boil, the volume level of the noise was consistent and didn't increase. Maybe I'm being paranoid and whimped out unnecessarily but didn't fancy damaging the expensive electronics until I'd got the all clear on here.

I didn't have the PC hooked up to the machine but everything else was as you'd expect.