I have the base model ender 3. I can’t find the forum for that model so I will put it here. I added 3 upgrades. The sprite extruder the cr touch and the dual z axis. The board is 4.2.2 and is running the 4.2.2 ender 3 sprite extruder firmware. During auto home the z axis goes down and then hits the bed and keeps going down. It doesn’t stop until I turn the printer off. All axis work normally up and down by using the move axis. I have tried 3 different firmwares and have had the same problem. I tried someone’s firmware for the ender 3 pro with the sprite extruder and cr touch. The cr touch firmware and the sprite extruder firmware. I have looked on Reddit and other forums and haven’t found anyone with the same problem. Video here IMG_6782.MOV - Google Drive don’t worry about the bed I have a new one I got for Christmas. Don’t worry about the power supply either the thread is gone ima tape it. The z axis limit switch is pressed after the extruder touches the bed.
I have an ender 3 s1 that I just upgraded with the extruder pro. Mine does the same thing during autohome except it makes a terrible grinding noise till I shut it off. I have found NOTHING online to fix this issue.
Same grinding noise too. After it hit the bed
If you have a CR Touch installed, make sure it works… Press home z axis when nozzle is above the bed 100mm ish, as it goes down, press the pin up, if the bed stops the CR touch is working. Therefore something else is wrong!?
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Yes ive tried it, and cr works. It starts grinding before the nozzle even touches the bed.