I haven't sent the parts because I managed to work out the issue with my printer. I had to reduce the Flow in Cura, now have a perfectly fitting set of parts that slide nicely as opposed to before where had to be jammed in. On other slicers its the extrusion multiplier would need reducing. I have calibrated the steps before so Im confused the flow had tp be reduced so much, down to 70% for layers other than the first. Perhaps I need to revisit the steps calibration for the extruder. Im putting this here so others that may have the same problem might benefit.