I've finally been able to set aside some time to get my Kickstarter R2 printer setup, and I've had great success with a few smaller prints that probably use only about the center 3-4 inch portion of the bed. I've moved on to print some other larger objects, and despite spending 90+ minutes a few different times running through the initial z-offset, fine-tune z-offset, and running through the bed leveling (guided mode) - my prints start to peel up at the edges, even though at first glance the first layers appear just fine. Running the various "lines" tests I felt I got the bed relatively level, with lines appearing fairly even on both sides. I have also noticed that most of the spiral level bed test have blended together into one line, with the exception of the little tiny zigzag pattern on the outermost ring/edge at the 3 o'clock position. I'm using Cura for Robo 2.5, and included a screenshot of my printer settings in the gallery as well. The prints didn't exhibit the "curling" at the edges until at least a couple of hours into the print job. The first print of the bottom half of the case utilized a 6-line thick brim, while I used no brim/skirt/raft on the top portion of the case. Current z-offset is -7.15. My Robo R2 did not come with their little leveling gauge/tool, so I've been using either a half sheet of either plan white printing paper or a half sheet of thin/light card stock to help set my z-offset. I'm using eSun PLA Pro+ filament - extruder temp of 210, heated bed at 60. Even with a brand new roll of filament, the issues occur. I would greatly appreciate any advice you can provide me. While I fully admit I'm a 3D printing novice, I haven't encountered these issues with my Robo C2 once I successfully calibrated my z-offset.