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added link to PCB comparison
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[http://cncdrive.com/datasheets/2HSS86H.pdf HSS86 2-Phase Hybrid Stepper Servo Driver]
 
[http://cncdrive.com/datasheets/2HSS86H.pdf HSS86 2-Phase Hybrid Stepper Servo Driver]
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[http://cncprint.blogspot.com/2017/05/din-rail-mount-for-stepper-drivers.html DIN Rail Mount for Stepper Drivers 2HSS86H and 3HSS57 or DM556 [3d printable]] (shows PCB photos)