I've been using cadkey 2D for designing product, mold assemblies, and mold inserts since 1996. Our largest mold frame is a t-series dme mold 15 X 18 , two cavity. I will be switching to a 3D software, which one I do not know. that's why I'm looking and trying to get some questions answered. 1] what was it like to switch over to SW. The time frame, converting old files that you already had over to SW. 2] how long before you seen that you were using part/assembly/drawing files from SW in a reasonable amount of time. 3] how about revisions, i know with 2D it takes forever in a days age to do revisions. 4] can you use variblies instead of actual dimensions in excel that will control a given shape. example say i have a standard block with a length, width, and height. i will use this block alot for certain products. the length may change or the height. can i set the length to X and the height to Y and than input any numbers to get what i want? 5] the most important question. the thought process in a mold design. i have a product and place it in a blank mold frame and than place all my eject pins, support pillars, springs, runner system, ect. i need to know if i can still start out with creating an assembly to view to make sure that everything is fine and than detail all components/inserts/mold frame later. I know that SW works in a sketch world first, than create to final part. I'm just not sure how? I guess the most important thing to me is how to start a mold design, because it seem difficult with SW. If you could add any input of how you would go about doing this please let me know. Thanks