Wider Robot Tank Tracks

I added some wide sections to the bottom of the track link to make it look more like a real tread. I removed the weight reducing holes in one of the drive gears and added holes that allow a standard servo horn to be screwed to the wheel.

When printing the tread links, use support to hold up the hinge sections when it is printed. This seems to work quite well so far. I print about 40 at a time. They will need some cleanup with a file and drill bit when complete.

Kudos to the original de