4x4 Post "Arm" Topper for Bird Feeders

I bought a suet bird feeder but didn't really have anywhere to mount it in my back yard. There's an old fence bordering my house which had some 4x4 posts on it - I decided to try and design a topper for them to mount bird feeders on.

I've included 3 STLS, each with a different number of arms. I have only printed the one arm version so far, but will try the others I think. While designing, I thought about making the arm specific to the size of the hook on my suet feeder instead opted to go wit