Impossible Dove Tail Sphere (Linear)

This should definitely be printed with supports and may take a little bit of cleaning up before it looks good.
If you use both of the _Tight variations there is 0mm tolerance.
If you use one of the regular and one _Tight variation there is a .15mm tolerance.
If you use both of the regular variations there is a .3mm tolerance.

On my Printrbot simple metal I found the .15mm worked well but on a Makerbot (5th gen) I found the .3mm tolerance was better.