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"Motherboard only" version

This version consists of the motherboard only. Recommended if you are building your own CNC machine from scratch.

"Motherboard + Expansion Card" version

This version includes the motherboard and the expansion board. The latter is required if you want to use the additional I/O lines and the LPT-style connection. Recommended if you wish to convert an old CNC machine from Mach3-LPT style to ESP32-GRBL style.

"Embedded stepper drivers" version

In this case, the expansion board also mounts the stepper drivers, which must be duly cooled with a heat sink. Recommended if you want to build a desktop CNC machine.

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