This is a replacement arrow rest for the Barnett Centershot youth compound bow. This also goes by the name Mossy Oak, Green and Bottomland.  The arrow rest that came with the compound bow will break quickly if the arrow is not oriented correctly. My 3D printed part is stronger and less likely to break than the original part.
Just remove the retainer ring, remove the arrow rest, replace it with this part, and reinstall the retainer ring.
You can see the replacement installation video here:
https://youtu.be/itvQ-uysv6A