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Hi, at the moment is not possible. An alternative to the suggested motors, are the 28bjy-48 stepper (but they are slow AF) or the sg90 micro servo motors (you have to cut them, modify for 360 rotation and you lose the space for the battery) so my tip is to chose the N20. All the future mods, will be based on this version of SMARS and the compatibility with alternative chassis will not be guarantee.