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Printed parts mate together more accurately and securely if their mating surfaces are actually flat. Less torque is needed to secure parts whose mating surfaces are in good contact.

Flatten mating surfaces that were printed on textured print plates by wet lapping with wet/dry 600 sandpaper on flat glass plate.

Do not lap so much that you dimensionally change size or shape. Remove just the "high" points of the texture

Remove retraction zits from top surfaces or irregular shapes with light strokes of a metal file. Just one or two strokes are all you need.

Be mindful of raised features like index pins when flattening surfaces! Do not damage raised features

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