Introduction
Tools
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            If the Z-axis is no longer working. 
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            disconnect the power cable to the printer and open the bottom and on the mother board switch the cable to Z-step motor with the one to the extruder step-motor. 
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            close the bottom and start the printer in setting mode. 
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            request the extruder to move forward a little, and if the Z-motor move, you can confirm the Z-motor is working as expected. 
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            You can order a new driver online. 
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            I choose a DM556, because it is cheaper than the DM542. 
 
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            Disconnect the power cable again and open the bottom of the printer 
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            There is enough space to place the driver as on the picture. 
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            You need to drill two hole in the frame on the back for the two screws to hold the driver. 
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            Take you time to mark where you need to drill as it will be visible from the outside later. 
 
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            Connect the power directly to the 12V power supply. 
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            Cut the cable to the Z-axis at approx 15cm from the plug of the motherboard. 
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            Save the 15cm left! 
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            Connect the A-, A+, B- and B+ to the right place. 
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            Use as much as possible the X and Y connection as a reference to connect the Z! 
 
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            Use new wires to connect the control signals from the mother board to the external driver. 
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            Carry over the way is is connected on X and Y. 
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            use later zip-tie to prevent all the cable you add to move and vibrate when the printer will be running. 
 
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            The whole idea is to bypass the original onboard driver (which is under dimension, I think). 
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            You can remove the mounting screws of the motherboard to remove the connector and reuse it on the similar position as X and Y. 
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            OR you can simply solder the each wire, one by one. 
 
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            I selected 2,1A: SW1=off SW2=on SW3=on. 
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            I selected 3200pulses/rotation: SW5=on SW6=on SW7=off SW8=on to match the the movement of the printing surface. 
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            You can close the bottom of the frame and connect back the power cable to give a try! 
 
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One comment
I’m having an issue with my X-Y motors one of the stepper boards gave out and I bought two of these as a replacement where would I start