This keyring can be printed with a single colour extruder, just align everything in the slicer and then put them in separate files then print the base first and if step are written in other file then follow the steps. Remove the small block at the corner at every print and try to put a z hop of atleast 0.2-0.6mm when using the design files (no need for the base files). if you have a multicolour extruder then just use the file that has "full" written at the end.