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The BTT SKR is a 3D printer controller using a 32-bit LPC (Arm, baseically) micro, so it'll easily support 4 axes and have plenty of leftover power/expandabilty. The main gotcha could be spindle control, but... hm, yeah, the source indicates that they just use a heater MOSFET for spindle PWM, so it's not going to be much different from a stock 3018 controller.
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