I finally have my big box up and, after a lot of work, in tram. I now have an issue with setting the z offset. I might (probably) have screwed it up along the way, but I no longer see the "Z Offset" in Marlin. In addition while trying to grease my Z threads I can only get the build platform to move about 1/2 way down. It still reads that it has moved 280 mm but is not sticking or anything, just a deliberate stop. I am kind of thinking the firmware is goofed up at this point and I need to reinstall it. Any Suggestions?