Thingiverse
MakerWorld
MyMiniFactory
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CGTrader
Youmagine
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Etsy
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Axminster 3D Printable Models
Disc sander dust/air intake cover for common combo belt/disc sanders, Ryobi, Grizzly, Rikon, and others
Printables
cookiecrook
20mm MFT hole plugs (specifically for holes with a 45 degree chamfered top
Thingiverse
DaveKNL