A beautiful crop circle appeared at Hannington in Wiltshire on the 7th May 2011 in oilseed rape crop. Check youtube for nice moving images:
Product can be made of several materials. Polished Alumide seems a suitable material. Costs can be reduced significantly by decreasing wall thicknesses. This model is solid, has radii, symmetrical, not hollowed....
Model can be downloaded freely. I don't charge a personal fee for modeling work. If you wish additional changes I might be able to make a change on request. For questions, rewards, remarks, feedback, you can contact me @ firstname.lastname@example.org. If you printed one of my products in one of the materials, please send me some photo's or learnings. Be careful with selecting a material.