I rarely ever do plastic product design, only mold design. Therefore I never have a need to use PhotoWorks. So I really don't know how to use it very well. I am on a project now where I am doing some product design for a customer. To sell the design to him, I needed to render it as closely as I could to the molded part. I think I have done decent considering that I have been using PW for a whole 5 hours. But I have run into a problem. When I render it, there are some surfaces, that are hidden from view, that show up with a bunch of black lines. I can't figure out what the problem is. Since it is difficult to explain, and the fact that I probably wouldn't understand your suggestions due to lack of PW knowledge, I was wondering if any of you PW gurus would be willing to take a look at it to see if you can figure out the problem. Also, if you have any suggestions to improve the render, I am all ears. If you will, I will send you the parts and assembly (6 small parts) as well as the custom PW materials that I used by using the "Pack and Go" feature of PW if you want. Any takers? TIA