Creality Ender 4 CORE XY

Okay, so I have climbed a major mountain and gotten all the kinks worked out in my Ender 4 and everything is working great......until.......I tried to print a small job tonight and my extruder is pulling the filament BACKWARDS and away from the nozzle! What the heck?! Anyone know what is going on and could advise me what to do?

I just got and assembled my Creality Ender 4 printer and almost everthing went okay.
But when I try to Home All the Z axis misses the last 5-6 cm. It never hits the end stop.

Does anybody know how t fix this?

I have the Ender-4 with laser engraving kit and was wondering how the process for that works. Every time I try to engrave something the whole engraving area is filled. No details or anything. The whole area is engraved. How do I fix this problem?

Hi,
I'm thinking about add an extra Z stepper Motor in the Ender 4. Does anyone know what is the exact model of the stepper motor?

I'm not sure if the motor is like this:
https://es.aliexpress.com/item/1Pcs-Lot-CREALITY-3D-CE-Certification-2Phase-RepRap-Stepper-Motor-42-motor-42-43-3D-printer/32799106868.html
The metal part is different.

Thank you very much.

One of my stepper drivers for the Ender-4 is clearly dead (doesn't step, very quickly gets very hot, screen reports max temp error, confirmed by swapping to other slots). I'm not sure what is a good replacement.

Has anyone tried substituting the TMC2130 drivers? Advice on a replacement?

Also, after removing the faulty driver I still see the MAX TEMP error; could there be additional failure, or is that expected from removing one of the driver boards?