Chris,mine is a series1,but a boss 2 or 3,dont know for sure,control was gone when i got it.Has original steppers,with gecko drives.On my offsets I touch off a 1.00 block with the tool on top of the part,or the longest tool if more than 1 is used.Then if you change to a different part height just raise or lower the table and retouch the tool,or longest tool off of the new workpiece.The offset values will remain the same,your just moving the work to a known distance from the tool tip when the machine is at zero.Thanks for your interest,I was wondering what kind of rapid your able to get with the factory stepper drive,im getting 140 ipm with the gecko on x and y but only 100 on the z,my z motor is a little weak.
Joe