this is going to be a short post about how to delete a user layer from the model store in AX 2012.
to delete a user layer from the model you first need to install theManagement Tools from your AX 2012 setup. Once this is done, you can access the Microsoft Dynamics AX Management Shell and write the following script:
axutil delete /layer:Usr
See the picture below for more details:
As you can see, deleting a layer is not difficult at all and it happens fairly quick too. Also, it is very important that you have a backup of the databasebefore performing this action.