Z axis calibration  

Z axis calibration

Few things for my understanding... First the z axis calibration and z adjust are used to get the right profile of the extrusion stream and good adhesion. Second I understand the need for a heated bed to counter warp and aid in adhesion.

My question is how consistent will the z axis be so many layers away from from the heat source? The process as I understand it is that we dial in the height of the profile to attain an optimal shape at the Z axis calibration step on a heated bed. Won't that shape change as the distance increases from the bed? If so the machine moves a certain distance per layer and if it changes it seems like that would add up to create a height error. I think the same could be said for the x, and y sizes. I suppose you could make an on the fly change but you can't dynamically change the G-code so an in process change would almost assure an error as well. If I want my part to be X high it's going to be subject to the calibration height.

Is there any truth to what I'm thinking? If so is there advice for striking a balance to deliver consistent build height. I was thinking you could check actual height against design height and make a small adjustment to the calibration and re-check.