Fit well into a purchased Holder. Might be slightly looser fit to slide vertically then the rod holder but snug and no play when seated.
Printed PETG, 25% infill and 0.2mm layer height
Printed to use as a Base Ball to attach My IPilot Holder, But could be used for anything 1" Ball Mount.
Edit: Revision Made
Added an M5 brass nut to the top and ran an M5x0.8x55m Socket Head Cap Screw though the center. This is the first time I made a 1" ball mount without an M5 in it and it broke first time on the water. With the M5 in it now it shouldnt be an issue again.
The author remixed this model.
Added a 1" Ball Mount for RAM arms or Ram/Inch ball mount accessories