Probe Repair and Troubleshooting

If the printer is reporting errors before you are able to Outline, Align, or Probe, it is possible that the probe has been damaged. Follow the steps below to determine the cause and repair the probe. 

To repair the probe, you will need an adjustable wrench and some needle nose pliers. 

Check the Probe Connection

The first thing to check is that the probe is able to communicate with the printer. 

  1. Mount the probe onto the printer carriage. 
  2. Open the GCode console (Alt+C)
  3. Without touching the probe, enter the command M125 into the console. This command reports the status of the probe - you should get the following response:

            > M125
            < Probe: ON

    If the response says OFF, proceed to Probe Not Recognized.

    If it says TRIGGERED, try to wiggle the probe tip a bit, and repeat. If it persists, proceed to Probe Shaft Adjustment.
  4. Push the probe tip up - it should not move more than a fraction of a millimeter (otherwise, proceed to Probe Shaft Adjustment). While still pushing up on the tip, enter the M125 command. You should get the following response:

          > M125
          < Probe: TRIGGERED

    If this is not the case, contact voltera support ([email protected]).

Probe Not Recognized

If the probe is not recognized by the printer (M125 shows OFF even when probe is mounted), there is a connection problem between the probe and the V-One. To debug the issue, try the following steps, and use the M125 command to check if the probe is recognized: 

  1. Clean the connections on the probe and the pogo pins on the carriage - use a cotton swab and isopropyl alcohol.


  2. Check the probe internals. Using a digital multimeter, follow the instructions below to measure the connections on the probe cap (the directions are indicated based on orientation in the image above): 
    1. Check continuity of the middle pin and the left pin. They should be connected. 
    2. Check continuity of the left pin and right pin. They should be open when the probe is idle, and connected when the probe tip is triggered. 

  3. Check the V-One. Power cycle the V-One. Using a digital multimeter, with the V-One powered on, follow the instructions below to measure the pogo pins on the V-One carriage (directions based on the orientation in the image above):
    1. Check voltage between left pin (high) and right pin (low). Voltage difference should be between 4.5-5V. 
    2. Check voltage between middle pin (high) and right pin (low). Voltage difference should be between 4.5-5V.  
  4. Ensure the cap is snug: Use an adjustable wrench to grip onto the flat portion at the top of the cap. Hold on to the probe and twist the probe cap counter-clockwise, and ensure that it is tight.


If the problem persists, contact support.

Probe Shaft Adjustment

If the probe is still producing errors, it is likely that the probe triggering position has shifted. To resolve the issue, you will need to disassemble the probe. 

  1. Loosen the probe cap: Use an adjustable wrench to grip onto the flat portion at the top of the cap. Hold the probe tightly and twist the cap clockwise 90 degrees. 
  2. Remove the probe cap: Lift the probe cap away from the probe - this will expose the probe shaft. Remove the spring on the probe shaft - don't lose the spring!
  3. Disassemble the probe: The inside of the probe consists of 3 main pieces, shown below - the SHEATH (left), the SYRINGE & GUIDE (middle), and the SHAFT (right).


    The guide is the black tube inside of the syringe - this is what we will be adjusting. Remove the syringe from the sheath, and the shaft from the guide. 
  4. Adjust the probe guide: In this step, we will use a pair of pliers to manually adjust the guide.

     The black piece in the middle of the guide can be moved either up or down. Typically, you will have to move the guide up. However, if your probe was reading 'TRIGGERED' even when you were not touching it, you will have to move the guide down.

    Hold on to the syringe with one hand, and gently grab the top of the guide with pliers, as shown below.

  5. Gently pull the probe guide out by a small amount. Place the syringe and guide back into the sheath snugly. The top of the guide should align with the top of the sheath. Repeat this step until it looks like the picture below. 

  6. Re-assemble the probe (making sure to place the spring on top of the collar of the probe shaft), and mount it on the printer. 
  7. Check the probe tip: Push the probe tip in until you feel resistance. The tip should retrace a small amount, but no more than 0.5mm. 
  8. Check the probe connection: Type M125 into the Gcode console, both without touching the tip, and while depressing the tip. It should only report 'TRIGGERED' when you are not touching the probe tip - otherwise, you must move the probe guide down in the syringe. Return to step 4 and repeat. 
  9. Test the probe: Type D104 into the Gcode console - this initiates the probe calibration procedure. If the procedure succeeds without errors, your probe is good to use! Otherwise, repeat from step 4. 

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