Orientation Issue with Cura (in general)

[printator 0]

I designed a .58 caliber minnie ball (bullet) to print on my Creality CR-10s.   When I put the model down on its base, so the nose is pointing straight up, I hit Prepare and the cupped end (which is a gentle cupped area requiring no supports), comes out flat and solid.   Turn the model on its side, and the cupped end appears and also prints out.     I'll enclose two snapshots of the original model, which one shows it standing straight up with a solid end on the bed vs the other is on its side and you can clearly see the cup on the end.

 

Is there a something I missed on the settings?  Thanks in advance.

[nallath 1,118]

Your model is probably not manifold. Check it with a repair tool.