Here is what I did. I got a piece of 2 inch PVC irrigation pipe, cut it down one side. Then cut away all the unwanted material. Carefull use of a heat gun, and I formed it to my coffee cup. The one tip I have on this is get a piece of pipe longer than you need. That way you can leave a long tail at the top, later to be bent over at 90% and attached to the dash. A couple of hours with a rasp, sandpaper, and paint and you have a cup holder that looks as good as any you can buy, plus you can customize any way you like.
