hi - i'm just getting into 3d printing.

i bought a cheap printer just to start me on the learning curve - it's a CTC duel head - it looks similar to a makerbot.

everything looks ok apart from the printing nozzles - there is a difference in height of about 1.5mm or 1/16" between them.

i'm assuming that this is not normal & if so can they be adjusted? - i don't want to touch them without some advice - cheers