I have seen several posts about fit, resizing, and trim of parts.
Being older, with many tools, something that I used on my builds that I think anyone who is fitting 3d printed parts with close tolerances should have. Used it without thinking about it too much, have my own machine tools/wood shop/more than I can count tools.
General Carbide Deburring tool:
Usually about $12USD at most hardware and tool stores.
Zip the edges with it easing it slightly improves fit, and lightly chamfers the edge so it isn’t sharp.