A gear bearing inspired from Emmet's. It operates on the same premise, but whereas his uses herringbone geared rolling elements, mine uses geared rollers with conical ends. This results in a more sealed design, one that is a bit easier to print, and (I think) it can tolerate more axial loading. The design still needs to be refined, so a couple drops of oil can make it run smoother. No OpenScad version yet.