Relative newbie (a month) but obsessed with understanding why/how things happen and getting the most out of my toys. R1+ Hatchbox PLA Dual fans and ducts Buildtak surface Matter Control Observation: As others have said, the middle of the display wasn't the middle of the print bed. Ok, not a big deal on smaller prints. BUT, it also appeared to 'move' on me. I.e. it wasn't always the same offset. I'm not positive about this, as it was small, but it seemed to be a moving target. Again, not a big deal on smaller prints. While troubleshooting a Y-axis limitation (found to be a pinching ribbon cable) I found that my Y axis would show me inconsistent negative values in the low end. As I tried to stretch the limits of my print area and understand where on the print bed a print will actually land, I started to see this following: If I attempt to manually advance the Y (or X or Z) beyond their expected high stop with the software (advance via control settings). The Y number will continue to rise, though the head/bed cannot move. So say I have 252mm of Y travel. I can click on the Y and it will hit the end and the Y will continue to go up to 253, 254, 255... But the bed didn't move, of course. It cannot. Then when I back down, I will hit the home limit at something above 0. Say I 'thump thump' on the top end for 8x1mm clicks, I will hit the home at a 'coordinate' of +8mm. If I 'thump thump' at the bottom for now 10 x 1mm clicks, it will show me -2. I understand that this is all relative. But I wonder that if the Y is 'shifted' this way by say 5mm and the Y is shifted this way by -10mm, then what shows up on the Matter Control screen and what shows up on the bed will be different by 5 and -10mm respectively. Make sense? So If I 'thump thump' a couple of times, it messes with my 0s and then matter control and my printer are off from each other. I do have G28, homing, in my startup G code, but reading the g-code wiki, it seems to state that this simply moves to the limit switches. It's not clear to me if this relative coordinate is used in the calculation from the g-code of the print. A) thank you for reading B) does the above make any sense? C) when/how can I reset the 0s on each axis besides the sledgehammer approach listed above? D) does it even matter if the 'home' of Y or X is not at zero?