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The first crop formation of the summer 2008 appeared in England on April 19, on Waden Hill between Avebury and Silbury Hill, in bright yellow canola (AKA rapeseed). It was close to 200 feet in diameter, up near the brow of the hill.
The model is solid and symmetrical, radii implemented.
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 @ email@example.com. 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.