Do I need a spectrum ST4 to operate the cart? Logan Steinfeld May 25, 2017 23:59 Updated Follow Yes, the cart requires a stepper-based controller capable of driving a 1 Amp motor through a 4 wire stepper interface. The legacy TB3 or the spectrum ST4 are perfect for this! Related articles Assembly instructions eMotimo spectrum ST4-101 programmed video What does the cart look like? What is the payload it can support? How big is it? What comes in the box? eMotimo Fz - Assembly Instructions and Setup Will the spectrum st4 work with my Rhino EVO slider Comments 0 comments Please sign in to leave a comment.