This is a guide for creating inlays using Orca slicer and Tinkercad
This method is the easiest to implement with minimal changes to your Orca setup: https://github.com/BigToyBox/Inlay-Guide/blob/main/Build%20Plate%20By%20Object%20Inlay%20Technique%20with%20ORCA%20slicer.pdf