If you are just printing one part the not noticing may be true but if your part is part of an assembly suddenly your model doesn't fit correctly and you are left with the unreasonable expectation of adjusting your model to make up for shortcoming of a 3000.00 machine. Failing grade from this owner but stuck with the problem none the less. I too was fed the standard response of gantry belts and calibrations and still no fix. I own the 2xEXP model and this is just one of the problems I've encountered.