Sand with coarse grit first, then progressively finer grits
Use needle files for tight corners and small edges
Trim rough edges with a hobby knife or deburring tool
Apply heat carefully with a heat gun to soften surface imperfections
Use filler primer to level minor roughness
Wet sand for a smoother finish and less dust
Use epoxy or filler putty for larger gaps and uneven edges
Reprint with lower layer height for cleaner edges
Reduce print speed and improve cooling to minimize edge roughness
Orient the model to place visible edges away from support areas
Remove supports carefully and clean up support scars
Use acetone vapor smoothing for compatible ABS prints
Use chemical smoothing methods only for materials that support them
Finish with polishing compound for glossy edges