Hi, I am new to this forum, but not new to 3D printing. i've read and learnt a lot trough this and other forums At my work we have an large 3D printer, which needs an overhaul due to malfunctioning and outdated components. i've figured out most components, the only thing i can not get my head around are the stepper drives. the machine is quite large (print space of 400x400x800), and uses NEMAby markhelifreak - Controllers