3D Printing Failures: 2022 Edition: How to Diagnose and Repair ALL Desktop 3D Printing Issues by Aranda Sean

Author:Aranda, Sean [Aranda, Sean]
Language: eng
Format: epub
Published: 2021-12-07T16:00:00+00:00

You can then clip the positive lead of your meter to the metal shaft on the screwdriver to help read everything out while you change it. If you do not have a clip to connect the lead to the screwdriver, you will need to test, tweak, and test again. Then touch the positive lead (or the screwdriver if you have it clipped) to the potentiometer on the stepper driver. This is a very tiny screw-like object on the driver. You will then see a voltage number on your multimeter. Remember that your printer is powered on so make sure to only touch a ground and your potentiometer. The number your multimeter reads is your VREF. Be sure your VREF is the proper rating for your machine.

You can turn the screwdriver clockwise to increase the voltage, and counterclockwise to decrease it (which is actually the opposite on some drivers, so just make sure you are testing after each small turn). A 1/8 turn of the potentiometer will make a drastic difference in your VREF, so make sure to not turn too fast. Turn a very small amount, retest, and then continue until your multimeter is reading the correct voltage.

Once you get the proper readout for your printer, plug everything back in and run another test print. If your extruder VREF was set too low, then this should drastically reduce extruder motor skips.

Sometimes you will have to reduce the VREF on your extruder stepper motor if you are swapping from a full-sized stepper to a pancake one, such as going from a standard Ender 3V2 extruder to something like the BIQU H2, which uses a smaller stepper motor to turn the extruder.

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