ZBrushCentral

How to "fill model" for 3D printing

I am trying to print sections of an engine block and want to make the interior (cylinders, crank cutouts etc…) a solid. I want to avoid wasting time & material on printing internal structures of the engine. I am stuck and do not know how to go about this. Any help would be much appreciated.

Attachments

Screen Shot 2016-10-07 at 11.14.43 AM.png