Used the original design from OceanHikerMike to great effect for about 100 dives last year but it broke where the cap meets the axle. I increased the outer diameter of the axle by 4mm while keeping the inner diameter the same. In theory is should be more durable.

While it reduces the overall reel capacity, my line never filled the original so not an issue for me as a recreational non-cave, non-wreck diver.

Prusa

I3 MK3S

No

No

.3

100

Imported the CAD files from the original into Onshape, removed the fillets where the axle meets the endcap. Thickened the axle face with the teeth by 2mm. Replaced fillet.