Grounding a LM2 15W

So I’m having the issue where the laser is shutting down anywhere from 5-30 minutes into a burn. I’ve purchased some ferrite cores which should be arriving in a few days. I picked up some 12gauge wire for grounding along with an alligator clip.

I saw someone attached a wire along the X-Axis but where should I attach the alligator clip to? I don’t have a computer anywhere close by but was wondering if I could attach the clips to my air assist pump since it uses a grounded plug. Maybe on the air pump itself or on one of the screws?