I ended up ordering the probotix unipolar drivers and breakout board. I also ordered limit switches and a 24v fan. I currently have a 24v 5 amp power supply. I am wondering if that will be enough to drive the motors I have. The drivers should be here tomorrow or Friday. I noticed people using a shock to help lift the spindle. Will the 400 in/oz motor lift the spindle. I know running it in unipolar I will only get 283 in/oz. Is this enough to move the head up and down without assistance? Any input would be appreciated.