that's good to know about the AM882 drive. originally i bought 4 nema 23 4Nm with the intention of using 1 each for the x,y,z and a spare for the fourth axis. but soon realized that i would probably need 2 for the x axis. ( 1 on each ball screw). maybe down the road i might just follow you down the road and replace the 2 23s for a 34, now that i know i will just keep going with the 23s and 60 VDC power supply. cheers for that.