There are differences. I don't have both though. The 3000H is heavier built. From what I know, the 3000H has alarger spindle bore, I think 1-3/8 vs .750 for the 3000. The 3000H can use 5C collets, and the three I have have a pnematic drawbar. The spindle is a A2-4. The tool turret is slightly different between the two. The main difference is the ID toolholders. The 3000 uses block that bolt onto flats on the OD of the tooling plate. The 3000H's tooling plate is round. The ID toolholders have a flange that blots into the slot of the tool plate. The 3000H is fully enclosed. The 3000 is open on the tialstock end. There are other differences too.