While these two models have the same framework and internal components, there are two main differences between these two models. The RoadRunner D4+4.0 comes with a standard steering damper, included with purchase and includes a full year manufacturers warranty. The Nanrobot D4+3.0 does not include a steering damper, and has a 6 month manufacturers warranty.
What is the difference between the Nanrobot D4+3.0 and RoadRunner D4+4.0
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