Custom seals to keep debris out of linear bearings?

Plastic filament won't work for bearings here, because the bearings must move freely on rods even when twisting pressure is applied.
My main problem is a dire need to make 8 mm bearing seals that actually fit the 8 mm rod. The silly rubber seals that come with cheap bearings have a gap wide enough to allow tiny particles into the bearing.
Any ways to make close-fitting but easy sliding bearing shields out of whatever material?
Thanks.
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On 06/04/2021 21:41, John Doe wrote:

Design something and print it with TPU filament with an ID a bit smaller than 8mm, that's assuming your 3D printer can handle flexible filament.
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On 04/06/2021 01:41 PM, John Doe wrote:

8mm valve stem seals.
And springs wrap around them. See?
https://i.ebayimg.com/images/g/ZfIAAOSw8kVcAN8m/s-l800.jpg
Nothings getting past these.
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On Tuesday, April 6, 2021 at 1:41:59 PM UTC-7, John Doe wrote:

For sliding on a rod, a good seal is a bellows around the rod... which also keeps dust off the sliding surface.
Another traditional method is to use felt (oiled, perhaps) or leather against the sliding surface.
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