Looks like I’m still at the Newbie stage. Started back in Oct 2018
The part of a 3D print which I reconfigured a few times in order to print it.
All printed fine until I added that bulge on the backside. Now it will print to the lower edge of that bulge, stop there then move up to the higher edge of the bulge and resume printing (in the air).
OK I checked it with Solid Inspector and it kept showing internal edges fault (which it can’t fix) so the back to the “drawing board”, designated the part as a component and the Solid Inspector could fix that