Industrial conglomerate 3M (MMM) early Thursday is expected to report that fourth-quarter earnings rose 3% to $1.31 a share, with sales up 5.7% to $7.1 billion. For 2012, the Dow component previously forecast sales of $30 billion to $31 billion. That estimate includes the head wind of a stronger dollar. In December it raised its 2012 EPS guidance to $6.25 to $6.50, vs. analysts' forecasts of $6.30. 3M makes products as diverse as Post-it notes,