I recently finished my Leed 1515 build. I purchased the nema 23 high torque openbuilds steppers for it (in hopes of doing some aluminum CNC in the future). It runs great and i have already done some tests in MDF. the only question i have is if i need to adjust the blackbox to match up with the higher current stepper motors? the steppers are really loud. Everything is set as it came from openbuilds.