Adding texture for 3D Printing
To add a real texure to a 3D solid object for 3D printing you will need to do some 3D operations on the surace of the object. For example, to add the following 3D testure to a cylinder.=:
I made a section cut at an angle through the cylinder. The result was a region which was the exploded to form an ellipse. A triangular shape was swept along the ellipse with the resulting solid subracted from the cylinder. A knurling effect could be achieved by using sections in a mirrored direction, Or, you might consider use a helix.
For freeform geometry like the handle of an iron I'd start with multiple sections and sweep a shape around them. For bumps, create a block of a sphere then use the divide command to array them along a spline that is on the surface of the solid. Then use UNION to merge them with you base model.
