I don't like the wheel hubs that come with the Tetrix tires, in my opinion they have too much flex due to a lack of support from the axle. To alleviate this, I designed a hub that an axle can pass completely through, as opposed to being stopped halfway like the original. There is space for a bushing on both sides and mounting points for the Tetrix axle hubs.
I have included two different versions: one with built in supports, and one without. For the life of me I could not manage to delete the bulk of supports generated by PrusaSlicer, so I created supports within the model in the only spots necessary. These supports are designed to be clipped out with filament snips, and use much less filament than generated supports.
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The author marked this model as their own original creation.