Quote Originally Posted by Chester_lad View Post
Comes out at 19.67x19.58.20.11mm
Are you sure you are using PLA? Those values are more in line with ABS (less shrinkage) than PLA. As a general rule the shrinkage for ABS is 0.7% so you will need to scale up your model by this amount before you slice either in your CAD software or in your slicer.

However if you are using PLA then I would suggest calibrating your extruder before continuing.