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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.
https://www.thingiverse.com/thing:2318105

Customizable 3D Tolerance Test
by zapta