Hi m_c, thanks for the detailed info. Although it's a DIY build, it's a bit of a monster, 3000mm x 1650mm Steel frame with 9kw ATC (which weighs 35kg on its own) never mind the Gantry. The current Steppers (Nema34) I have are from my last build I was planning on re-using them, but I've managed to somehow brick my Z-axis Driver �� - Hence why I've started looking for a replacement and looking at Closed Loop set-ups, my power supply is 104Vdc, and the Drives are rated at 110Vdc