Sony WM-F65 F15 belt clip
Re-designed the whole clip, I did print the original one but was a bit too thick.
Sony Belt Clip A.stl
Sony Belt Clip B.stl
The new design is closer to the original and has a clip. The clip's hole is for 1.75mm filament that you can use, the only thing extra you need is a small spring to get the clip to have tension.
I used an old hair clip from my wife and took the spring, then used it for my new walkman clip.
No supports needed or rafts.
I do not have the screw for it but made the screw hole, this helps it clip to the walkman nicely.
I believe this fits other walkman models, but cant test as I only have this, but while Googling i found that the following walkman might work.
Sony WM-F15
Sony WM-F65
Let me know if it fits any other.
Cheers