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A simple PCB reference design to use an Arduino Nano with the [http://bengler.no/grbl GRBL] 3-Axis motion control library. Connects an Arduino Nano to 3 Pololu motor drivers and mechatronic endstops, and breaks out remaining pins for hacking use.
=PCB Design=
*add filtering caps on motor power supplies
*add custom pads for pullup resistors or filtering caps on limit switch inputs
=Parts=
*Pololu Stepper Driver
*Mechatronic Endstops (see below)
Motors and Power
*Stepper Motors. Obviously lots of variance here.
*Appropriate power supply for your stepper motors.
==optical endstop==