This is to remove the plastic/foam section from the fan cover, then attach this item with CA hinge material. Mount a micro servo inside the cover to actuate the Arrestor hook. Easy modification and it works great.

Creality

Ender 3 Pro

Doesn't Matter

Yes

I used .16

I used 10%

I used 2 walls, 4 top and 5 bottom layers. Use the original Arrestor Hook in the kit. You may want to print at 101% or 102% to enlarge a small amount, if you have issues getting the hook to fit. Mine worked at 100% from the printer to the model.