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Hey need some advice here.

Recently purchased an anycubic mono x resin 3D printer.

Every print I've done has failed so far. I've leveled the build plate correctly. I have other 3D printers that don't fail.

However, right after the bottom layer prints the z-axis suddenly seems to change the Z-axis above the VAT. It keeps going up and down like it's printing but it won't go back to the fep or home mid printing.

I've never seen a 3D printer do this.

Is it a safety feature after a failed print that keeps it from going home? Or is it a machine failure or is it a sensor failure?

Really not sure I'm heavily considering returning it now.

That doesn't seem to be a standard behaviour. Have you tried to update the firmware? Maybe something's buggy in there.

If I had to guess it'd be a software/sensing error rather than mechanical. I dont have the mono X but I have seen absolutely zero evidence of any kind of "mechanical safety" surrounding print failures. I have had a print fall off the plate, land at an angle, and then the print head crunch it into the plate and puncture the FEP. If it were mechanical in nature, you'd be able to go in and use the manual up/down to find if there were a burr or something on the threaded rod.