Track

Tracks are of great use, not only as a way to move a rover, but also as a source of many creations, such as tanks, construction machinery, etc. It is a good choice as long as you can think of it.
Manufacturing suggestion: Add three new parts (guide wheel, driving wheel and load wheel). The guide wheel (to prevent deviation of the track guide) is the beginning of the track, the driving wheel (to provide power for the track) is the end of the track, and the load wheel (to support the weight of the car body) automatically forms an encircling makeup (if there is a load wheel, it forms a trapezoid like a tank track).
Parts manufacturing recommendations:
(1) Guide wheel: the two sides are high and the middle is low, and the width is changed like a wheel.
?Driving wheel: the two sides are high and the middle is low, and the width is changed as a wheel.
? Load-bearing wheel: the sides are high and the middle is low, and the width is changed as a wheel.
?Crawler: The length is controlled by the distance between guide wheel and driving wheel, and the width is controlled by the width of guide wheel and driving wheel.