Circular dust cover - magnifying glass lamp cover
thingiverse
Dust cover for magnifying glass desk lamp (104mm inner diameter) https://www.amazon.co.uk/gp/product/B091HXH8CP. Printed at 0.28mm reasonably quickly and doesn't fall out upside down. Should work as a dust cover for anything else circular, measure the required diameter and scale accordingly in your slicer of choice.
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