Hello Chris and community! This is my first post here and let me say thank you for all your hard work what you did. I am truly impressed with amount of materials you put in place to share the knowledge as well as well established process with kits and hardware. Two weeks ago I placed my first orders for all components and now I have fully assembled arm. As about MacOS. Since you are using tkinter for client UI, I was able to run it but it is failing on serial port initialization. It is failing because you hardcoded COM as prefix for serial port which will work only for Windows. Linux based OS (and MacOS too) don't have serial port meta names like comX. Serial ports there will have path-like addresses. For example /dev/xxx. Client application works well if we will remove hardcoded "COM" string from ARCS.py inside setCom method. So instead of hardcoding it in the code, you can just let people enter full address in UI. For windows it is going to be COM3 and for MacOS it can be something like /dev/tty.usbmodem71008001