Yep, you can't see it in the photo but the base is vented. With those vents and the slot for the throttle control that provides sufficient air for the mower (pretty sure the OEM part for this style was also solid).
I've thought about this too, and for a similar reason. About a third of the way through my first sock I realized that knitting was contributing to tendonitis, at least on top of my day job which was non-stop typing. I've got a tub of yarns waiting for me to figure out what I'm going to do about them. I've watched videos from various folks about the 3d printed options.
One thing I've never really figured out is how the socks compare to something like a smartwool. It seems like they might be pretty prone to becoming loose. I'd be interested to hear your evaluation of the actual end product.
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