Z shaft connector
thingiverse
use for Prusa mendel z-axis. Strong enough to hold two rods. one side (small dim of hole) is for stepper motors and the other side (bigger dim of hole) is for threaded rods. Instructions print it sandwich them screw them (M4 screws and nuts) for the side of the shaft of stepper motor, tight the screw strongly! Super tight! don't worry, it won't be broken.
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