ABL auto bed leveling i believe you get with the pro, MBL mesh bed leveling that you get with the dual, it levels the bed using 9 points across the bed which is suggested to be a more accurate way of leveling the bed.......
Here is a simple explanation to what it does: https://github.com/MarlinFirmware/Marlin/wiki/Manual-Mesh-Bed-Leveling
ABL = Auto Bed Levelling - only used on Light and Pro BB's but you can swap to MBL MBL = Manual/Mesh Bed Levelling means you go through an interactive process, guided by the firmware, to determine the difference in level across the build platform.
Hi,im new here,,having spent 40hrs building, ,spent a day trying to set z offset and failed,,i have 1.1 with hybrid and titans. What updates and methods should i use to set bed height? Nozzles being skidded across bed is common place ,if not nozzle is so high that filament is not extruded directly onto bed,very frustrating. Also do i need fw from Alex to accomplish this? Many thx