Polaris Axle Dust Cap
thingiverse
One of my axle dust caps blew off, so I fabricated a replacement myself. It has held up for two journeys and not a speck of dirt, mud, or water has slipped past it. My Polaris is a Ranger 570, but this design should fit many other models as well. TPU would be an ideal material to use, as it will need to stretch around the mounting lip on the hub. Something semi-flexible like PCTPE (hybrid nylon) could also work effectively.
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