Dumbbell fat grips

UPDATE: It turns out, not all hex dumbbell handles are alike. In my collection, most of my dumbbells have 27.5mm diameter handles. But a couple are from different sets, and one is 30.5mm, and another 28.5mm.
The texture is also a little too slick. I'll probably add some patterns to the grips sooner or later.too.
If inspiration strikes, i'll get back into openscad and make this a full customizable thing.

Lately, I've been picking stuff up and putting them back down. Since time isn't free, I