Tanks are fun to build and have the added advantage of easily climbing over obstacles. You will notice that a lot of tank designs will have larger center wheels. Having a larger center wheel can be particularly useful if you want to climb up ramps or go over bumps. Without the center wheel, if you are climbing over a bump, there is a chance of getting stuck. However, when you have a larger center wheel, your robot will often be tilted. Your robot will not be constantly parallel to the ground, which can be a problem with calibrating any sensors you might be using for navigation. I encourage you to play around with larger center wheels on your tanks, but the models I provide here have smaller center wheels. You will need the parts shown in the following screenshot in the Bill of Materials to assemble the tread-bot:

Start with your chassis:

You will now make two of the following submodels, which are the tread assemblies. You will start out by attaching pins, axles...