Click "Live Preview Tracking" in the Preview Mode screen. It's right above the "Begin printing over USB" button.
Printable View
Thank you!
I tried printing this with Slic£r... http://www.thingiverse.com/thing:925556
It failed very badly. Just a brick!
With S3D it was perfect and worked immediately. No trying to break the joints etc. All I did was increase the extrusion to '1' in settings and a couple of skirts.
This was probably the most challenging thing I would ever ask my printer to do as tolerances so tight, Attachment 8411
So very pleased - utter perfection.
I am still looking at it thinking "WOW - How did that work?"
Picture attached though for some reason not right orientation.
Glad to hear that S3D is working for you - it has truly changed my entire 3D printing experience.