When they assemble the Cetus3D in China, sometimes they don’t adjust the height of the Z-axis good enough. But thankfully it’s easy to fix. You have to remove the three screws that hold the Z-axis.
Lean the whole assembly back and loosen the hex screw for the Z-axis adjustment plate using the supplied wrench.
Retighten the nut that holds the attachment rail and re-assemble the Z-axis. If you moved the Z-axis mounting plate the right amount, you should now be able to calibrate your Cetus3D printer.
And what a printer! After calibration, the printer has been running 24/7!
A minor snag on an otherwise excellent printer!.