Canon FD Lens to Nikon Z Mount Ring

Hello, today I made this Canon FD Adapter for my Nikon Z Camera, because I recently got my hands on a Canon FD 300mm F/4 for a bargain online. I am not an expert in 3D Modeling, but I made this using Blender.

Cura shows "Errors" in the print because it is not "Water Tight" or something, it ends up filling the middle hole with a small circle, which I cut with my pliers after the print was done. The lens didn't fit because of the metal thing from the lens was too big, I also cut the inside thing on the model and my lens then did fit perfectly. Printed with Supports and 10% infill. Note: If you know 3D Modelling well enoguh and want to fix this error, please make a Remix of my Model.

Infinity Focus guaranteed.

Have Fun.