Printing in the middle of the night requires a well thought-out strategy and timesaving operations.The belts on my Ultimaker badly needed some more tension, but I did not had the time to print one of the brilliant designs, available from Thingiverse.I sneaked into the childrens room and sto..., well, borrowed some Lego parts for the 30 seconds Ultimaker belt tensioner.---PROS:- ultrafast installationCONS:- You'll need children, preferably in your house   (at least regarding the acquisition of required parts).- You'll have to be VERY quiet!   If an eye opens - pray.- You'd better keep your hands off already assembled   parts your kids built. It's not worth it, really.   This would ruin a complete weekend...For the fun of it, I included an STL model, butit's not recommended to print it.Gähn ;-)