Not sure if my level of expertise will help in this case as I'm not really an advanced user in any sense.
It's also a bit hard to maybe judge from the picture what might be the root cause of the failed prints.
Have you tried any troubleshooting steps already with the printer? For example running the auto bed levelling and calibrated the offset again? I have seen other users in the forums complaining that they had to do this every print they made because of the offset was not saved between power cycles. Perhaps it's related to something like that?
Also, what version of the firmware are you using?
Are you printing from the SD-card or are do you have the printer hooked up to an external source? PC/raspberry pi or such?
Have you checked the belt tensions, and tightened everything to satisfaction? It's not uncommon that screws and bolts are a bit loose because of transportation of the equipment.
That cat I suppose is pre-sliced gcode already available on the SD-card? (I haven't checked my SD card actually)
Did you make some other changes when you sliced your phone holder? Supports, adhesion, print speeds, temperatures, etc etc?
Not sure if any of this is of any help, but at least you have some steps that you can check and elaborate on.
If you have the possibility it would also be nice if you could film the printer in action. It can give a bit more clues about the issue.