I've been browsing this forum the last couple of days trying to understand how to properly calibrate multiple tips. You guys have helped me a lot, but I still have a couple of questions. I understand to then say 'Yes' to the sphere has moved question, then calibrate your master tip at A0B0. I also understand to say 'No' to the sphere has moved question on all of the other tips to build a relationship between all of the probes. If I understand things correctly, you want to calibrate all the tips at A0B0 first, then the other angles. What I am confused about is if you need to add a new angle after calibration. I've seen posts that say that you can just calibrate that angle without breaking the relationships between the probes, and without having to re-calibrate all of the other tips and angles. We always take our sphere off the table after calibration, because it's in the way. I'm assuming I have to say the sphere has moved. Do I re-calibrate the master at A0B0, then calibrate my new angle? Do I have to re-calibrate the master, then calibrate the A0B0 of the tip I'm adding an angle to, and then calibrate the new angle? Any help would be greatly appreciated.