Prusa i3 Z Axis Calibration Tool
thingiverse
The easiest way to level your Z axis. Aditional tools aren't required. How to use: Lift your Z axis. Place the tool as shown at the foto. Make shure that plastic adjoins to the frame and the gate. If not: rotate your stepper motor a bit. Remember to hold the second one. Else: Place tool on the opposite side of the frame and jump to the step 3. To be sure that your printer is calibrated properly iterate this process one or two times.
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