Most people printing D&D terrain default to 0.12mm or 0.16mm layers because 'detail matters.' For terrain specifically, that's usually wrong. Terrain gets painted, dry-brushed, and viewed from table height — layer lines vanish under primer and drybrushing at that distance. 0.2mm cuts print time by 30-40% with zero visible quality loss on walls, rubble, and rockwork. Save the fine layers for face-detail on miniatures, not terrain. If your dungeon set is taking all weekend to print, this is probably why.