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It may be Eddiie's printer calibration. Close fitting parts can be an issue with FDM printing. Try printing a clearance test print, like the one developed by Angus at Maker's Muse. It prints a series of close clearance discs, and the smaller clearance you can move, the more accurate your printer. Here is an open source version based upon Angus's ideas.

Customizable 3D Tolerance Test
by zapta