Hi,
I just got my two mBots from the kickstarter campaign. Assembling was fun and everything seems to work, my daughters (10 and 11 ) are happy with ‘pinky’ and ‘blue’ 
One already fell to the floor and ‘broke a leg’ (a wheel) but thanks to the added repair kit, it was pretty easy to fix it.
My question: both bot don’t really run straight, both move slightly to the left or right. Is there a way to fix it, maybe some sort of trimming?
Thanks is in advance!
Andreas
Don’t know if you have already solved this problem. We had the same problem last night when we assembled our mBots. We discovered that a cable from one of the sensors was rubbing on one of the tires causing the mBot to pull in that direction when we wanted it to go straight. We re-arranged some cables and our problem was fixed.
Hope this helps.
Tom.
there is no closed loop regulation for the wheels.
You can set both motor speeds separatly to tweek direction deviation.