Probably saw it at the RC Panzer site.

That back grill is quite an opening. I've been thinking about just blocking it off somehow. It sure does let in all kinds of stuff. Dust, grass, and even found dead bugs in there, once.

Plan on taking it out this weekend. No more grass for now, though. When the grass gets really thick and wet in the summer, not only does it stick to it as it grinds it up, the sprocket grabs it and holds the tank in place at times. As powerful as the thing it, I don't really like it straining against something that may or may not give. Probably a good way to strip a gear, if that's possible. Or bend the final drive axles.