Running Solenoids from RAMPS
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Solenoids produce back voltage upon shutoff, so they cannot be driven directly by RAMPS without using protective flyback diodes. The RAMPS on-board transistors do not have flyback diodes with them. [1].
Thus, use external relays for switching. Use M42 with the numerous I/O pins on RAMPS. Such as the AUX pins on RAMPS.