A couple of changes that really helped the loop. And something I designed.
3D model links below:
Gear drive:
https://www.thingiverse.com/thing:6809229
https://www.printables.com/model/1051341-magnetic-loop-antenna-38-to-1-gear-reduction-drive
Coupling loop form:
https://www.thingiverse.com/thing:6626916
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