I agree it’s quite hot to touch and noisy.
I’ve had the 3D running for almost a week now to see if the heat will kill it.
On the hottest day in the UK for a while it seems fine but you wonder how all those solder joints will perform if it’s turned off and on again a few hundred times. Remember the XBOX 360??
I reckon it could do with a CPU style heatsink with another fan to be sure.