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Gaou
no its not too late but what do you mean by that ? what difference would it make if i had 0.9 deggre steppers ? is it better resolution or more than this ? I am a newbie at 3d printing and i dont have the mechanical and electronics knowledge to think of changes like this . it seems an everest to me to go from 1.8 to 0.9 but if you say it is worth then i have to consider it .
With 0.9deg steppers, the step size is half the size of standard 1.8deg steppers, so you get double the resolution. On a delta printer where the Z steps/mm is not very high (typically 80 or 100 microsteps/mm using x16 microstepping), this improves print quality a little. However, on a Cartesian printer it's unlikely to make any visible difference, because the Z axis is generally driven by a leadscrew or threaded rod so the steps/mm is already very high, giving more than enough resolution with 1.8deg motors.
0.9deg steppers cost a little more than 1.8deg steppers, and are best used with 24V power supplies. Some electronics struggle to drive them fast enough in some configurations, but the Duet is fast enough.