Part prints too low into the glass

[arichard 0]

I'm having a problem where my parts keep printing about 1mm too deep, so that the first mm of my part is missing. The Cura even shows my part is too deep, into the glass. I can not add any value to the Z coordinate arrow in the move option. There is no Datum plane there in my CAD (Creo 2). It does not matter what version of Cura I try (2.3.1, 2.5)

The only way to make this work is to use the RAFT support set with an air gap of 1mm or more.

Is there some setting I am missing?

Thanks for any help

Aaron

[DaHai8 74]

Not sure why Cura is automagically doing that for you, but try turning off Automatically drop models to the build plate in Preferences -> Configure Cura and see if you can then move the Z offset up enough to regain that lost 1mm.