So I bought my R2 and have had nothing but problems, first it was the extruder, that was replaced, then it was the IR sensor, and now this. My print bed will just moved up and down during a print. I tried the default files from Robo, same result. Now when I tried it this morning, during the bed leveling calibration at the beginning of a print it is pushing the bed into the extruder and not stopping. I submitted a ticket to Robo a week ago and have gotten no response aside from the assumption that since I hadn't added anything in 2 days that the issue was resolved. I uploaded the videos to them and still haven't heard anything in 5 days. So thus I am turning to the community to hopefully hear something back.