After unpacking my cetus3d from its box, I've noticed the motor on the extruder axis is 'bent' and on that axis and the z axis the belt alignment looks to be to the edge of the drive gear.
Mine was also bent, and the pulley at the other end of that axis had been broken off in transit I assume. After I re-glued the pulley, I bent the mounting plate straight - I assumed that it wasn't supposed to be like that
Mine was also slightly bent (tension maybe?). I printed and mounted this and put a screw in to adjust and it is as straight as can be now. (design not by me)
My box had a hole and inside there was a bent Y-axis motor bracket. The holder for the endstop was also broken, I had to bend the bracket back almost in line and loosen the endstop holder to carefully put it back into place, I hope that it will hold until I manages to print a replacement!