Vision Miner Wiki

Z-Probe

Z-probe reads 1000 instead of 0 on the 22 IDEX V2? Check probe values, toolhead wiring and shorted peripherals, then test the relay, diode and harness.

This guide outlines the procedure for troubleshooting the Z-probe on the Vision Miner 22IDEX V2. Ensuring the Z-probe functions correctly is critical for accurate bed leveling, first-layer adhesion, and overall print quality. Start with the probe value checks - they isolate the fault to the probe, the toolhead wiring, or a shorted peripheral. If those pass, continue with the signal path diagnostics: relay operation and wiring harness continuity using the diagnostic macro and a multimeter.

Before you begin - safety and risk

Read the Safety - Before You Begin article to understand the hazards involved in working on the Vision Miner 22IDEX V4 - including electrical, thermal, mechanical, and chemical risks. All procedures in this wiki are provided as recommendations only. By choosing to follow any procedure, you do so at your own risk.

This procedure involves working with the printer's electronics. Ensure you take appropriate safety precautions to avoid short circuits or electrical shock. Do not perform these tests with wet hands or on wet surfaces.

Required Tools and Materials

  • Flexible insulated wire (approximately 1 meter, stripped at both ends)
  • Multimeter with continuity and diode test modes
  • Ferrules or soldering iron (optional, for tinning multi-strand wire ends)
  • Replacement relay, diode, or probe sensor (if necessary)
  • Test Probe V2 macro file: Download Test Probe V2

Normal Z-Probe Values

The current Z-probe reading is shown in the Web Interface. The values below are the reference for a healthy V2 probe system:

Probe stateZ-probe value
Disabled, no probe attached1000
Disabled, probe attached, not clicked1000
Enabled, no probe attached1000
Enabled, probe attached, not clicked0
Enabled, probe attached, clicked1000

Any combination that does not match this table points to a problem in the probe chain.

Quick Value Check

  1. Enable the probe. In the Macros tab, navigate to System > Calibration > Testing and run Enable XY - Probe so the machine recognizes the Z-probe.
  2. Attach the Z-probe. Magnetically attach the probe to the toolhead.
  3. Read the value. The Z-probe value should read 0 in this condition. If it remains at 1000, the reading is incorrect - somewhere in the chain the signal wire is shorted to ground, or the probe itself is defective. Work through the checks below to find which.
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Checking the Probe Itself

With a multimeter. Remove the Z-probe from the printer and set the multimeter to continuity mode:

  1. Touch one multimeter probe to one magnet and the other probe to the other magnet of the Z-probe.
  2. The multimeter should beep continuously - current flows through the magnets.
  3. Press the probe tip (simulate a click) - the beeping should stop, indicating the circuit breaks.

If the probe does not behave this way, the probe itself is faulty.

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Without a multimeter. With the probe enabled (see Quick Value Check), touch a metal object such as a screwdriver across both magnets on the toolhead simultaneously. If the Z-probe value changes to 0, the wiring from the toolhead to the board is fine - the probe itself is likely defective.

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Inspecting the Toolhead Wiring

If the probe passes its own test but the value still reads 1000, inspect the four wires of the probe chain on the toolheads:

  • Tool 0: the two wires running from the probe holder magnets to the terminal block on top, and the wire from the hotend to the terminal block (attached with a lug-style crimp) - it joins one of the probe holder wires there.
  • Tool 1: the single wire from the hotend to the terminal block (also a lug-style crimp).

Make sure the insulation on all four wires is intact, with no visible damage, fraying, or signs of shorting - any damage here can short the signal wire to ground and cause the false 1000 reading.

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Isolating a Short in Connected Components

A short in another peripheral on the toolhead can also hold the probe signal down. To rule this out:

  1. Disconnect the peripherals. For both tools, carefully disconnect the following wires:
    • Part Fan (+ and -)
    • Tool Fan (+ and -)
    • Heater (+ and -)
    • Thermistor PT1000 (both wires)
  2. Repeat the value check. Perform the Quick Value Check again with the probe attached and enabled.
  3. Interpret the result. If the Z-probe value changes from 1000 to 0, the short was within one of the disconnected components. Reconnect them one at a time, re-checking the value after each, until you find the culprit, then contact our support team about the faulty component.
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Z-Probe Diagnostics Procedure

  1. Download the diagnostic macro. Click the link in Required Tools and Materials to download the Test Probe V2.g file to your computer.
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  1. Open the Web Interface. Navigate to the printer's Web Interface (Duet Web Control) in your browser.
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  1. Navigate to Macros. Click on the Macros tab in the sidebar.
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  1. Upload the macro file. Click the Upload Macro File button (usually located at the top or bottom of the file list). Select the Test Probe V2.g file you just downloaded and confirm the upload. The file should now appear in your Macros list.
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  1. Run the Test Probe V2 macro. Locate and run the Test Probe V2 macro from the Macros menu in the Web Interface.
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  1. Start the relay click test. The macro will display "Step 1: Relay Click Test". Click OK to start the test.
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  1. Listen for the relay clicking. The relay (located at the back of the printer, top of the main boards) will toggle every second for up to 2 minutes. Listen carefully for a clicking sound.
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  1. Stop the test early if needed. You can stop the relay click test early by pressing the X or U endstop on the printer.

  2. Confirm the relay click result. A dialog will appear: "Did you hear the relay clicking?" Select Yes to proceed to the next step. If you select No, the macro will abort with an error - the relay may need to be replaced.

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  1. Start the continuity test. The macro will display "Step 2 & 3: Continuity Test". Click OK to activate the test mode.
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  1. Prepare the test wire. Take a flexible insulated wire approximately 1 meter long, stripped at both ends. If using multi-strand wire, use ferrules or tin the ends with solder for better contact.
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  1. Test ground to relay continuity. Touch one end of the wire to the GND terminal on the Duex power connector. Touch the other end to the right terminal with the nut on the probe relay.
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  1. Observe the LED feedback. If the connection is good, a green light will illuminate inside the chamber, and the LED next to the E6 STOP connector on the Duex board will turn on. If there is no reaction, check the wiring to the relay. If cables are intact, replace the relay.
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  1. Test wire to sensor continuity. Ensure the macro is still running in test mode. Touch the end of the wire to the probe sensor.
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  1. Observe the sensor feedback. If the connection is good, a green light will illuminate inside the chamber, and the LED next to the E6 STOP connector on the Duex board will turn on. If there is no reaction, check the wiring from the relay's nut terminal to the probe sensor, verify the connector is properly seated, or replace the probe sensor.
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  1. Exit the macro if tests are complete. Press the X or U endstop on the printer to exit the testing macro. If all tests passed, the Z-probe is functioning correctly. If issues were identified, proceed to multimeter tests.

If no issue was identified during the previous tests and you wish to continue testing with a multimeter, do not stop the macro execution. The relay must remain energized for the multimeter tests.

  1. Disconnect the E6 STOP connector. Locate and disconnect the E6 STOP connector from the Duex board.
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  1. Set multimeter to diode test mode. Configure your multimeter to diode test mode.
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  1. Test the diode (red wire). Connect the multimeter's red probe to the red wire on the E6 STOP connector. Connect the black probe to the left terminal with the nut on the probe relay.
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  1. Check diode reading. The multimeter should indicate that the diode is functioning. If the multimeter shows no reading, the diode must be replaced. If possible, test the diode separately after removing it from the relay. If the diode is confirmed operational, replace the relay.
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  1. Test reverse polarity. Reverse the polarity of the multimeter probes (red to terminal, black to wire). In this direction, the diode should not conduct current.
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  1. Set multimeter to continuity mode. Configure your multimeter to continuity mode.
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  1. Test black wire continuity. Connect one probe to the black wire of the E6 STOP connector. Connect the other probe to the right terminal with the nut on the probe relay.
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  1. Check continuity reading. The multimeter should emit a beep and show continuity. If no reading is detected, the relay must be replaced.
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  1. Reconnect the E6 STOP connector. After completing all tests, reconnect the E6 STOP connector to the Duex board.

  2. Test Z-probe operation. Run a Z-probe self-test from the Web Interface macros to verify the probe is functioning correctly after diagnostics.

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FAQ

Troubleshooting

Support

If you could not find an answer here, reach out to our support team.

On this page

Required Tools and MaterialsNormal Z-Probe ValuesQuick Value CheckChecking the Probe ItselfInspecting the Toolhead WiringIsolating a Short in Connected ComponentsZ-Probe Diagnostics ProcedureFAQTroubleshootingSupport

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