Hi yes, microcontroller. If it does use 386 then we assume its has some storage device, first of everything make sure you make a backup copy of that :)
If you put motors in series it will not need more current, still 2-2.5a for all of them because same current goes through all. But they just add their coil resistance, so resistance has to be low to start with. Might depend on the power supply also, but i think that to be a good one. But it might be better to have just 1 motor for z, with a continuous belt with 4 pulleys. However i think it might have servo motors instead of steppers, and servo drivers may have controls other than step/dir/en, in which case i dunno if there is a reprap firmware to drive that.
If i understand correctly you want to scrap an old, but otherwise working z-corp powder printer into a reprap. That has to be a first, please document it somewhere with picture and so. It would make such a great read.
If you put motors in series it will not need more current, still 2-2.5a for all of them because same current goes through all. But they just add their coil resistance, so resistance has to be low to start with. Might depend on the power supply also, but i think that to be a good one. But it might be better to have just 1 motor for z, with a continuous belt with 4 pulleys. However i think it might have servo motors instead of steppers, and servo drivers may have controls other than step/dir/en, in which case i dunno if there is a reprap firmware to drive that.
If i understand correctly you want to scrap an old, but otherwise working z-corp powder printer into a reprap. That has to be a first, please document it somewhere with picture and so. It would make such a great read.