Instead of directly attaching wires to the bed clip this mod allows for the use of a drag chain. I used https://www.aliexpress.com/item/1005001795469984.html (10x15 R18) and modeled it for use of m3 heatsets. I recommend sanding the angled surface after printing for best results.
The separate spring is meant to be glued in after printing to allow for optimal printing orientations.
The author hasn't provided the model origin yet.