So there is that option in tune menu if it is enabled in Configuration_adv.h... Since Marlin is not the best in documentation I assume this option uses Steps as unit. And I try to understand it, while typing this, maybe I'm wrong then please correct me, maybe this can be useful for the Marlin Docu too. When the LCD "Babystepping Z:+000.0" these are steps, so "+001.0" would be one step + on the Z axis. we have 4000 step per unit..., Millimeter I hope, so +001 would be 1 mm = 4000 steps 0.5 mm = 2000 steps 0.1 mm = 400 steps 0.01 mm = 40 steps from Configuration_adv.h Code: #if ENABLED(BABYSTEPPING) #define BABYSTEP_XY //not only z, but also XY in the menu. more clutter, more functions //not implemented for deltabots! #define BABYSTEP_INVERT_Z false //true for inverse movements in Z #define BABYSTEP_MULTIPLICATOR 1 //faster movements #endif The "BABYSTEP_MULTIPLICATOR 1" is then a little low right? So for BigBox we can set it to 40 to have 0.01 correction. After I understand how many steps I have to dial in to change height by 0.01 Next question: Which way move the bed to the nozzle + or - ? OK - does move the bed up aka bed goes nearer to the nozzle. and + moves the bed down So basically as the normal Z movement works. Next Question: When is the step added? On every tick of the rotary encoder (instant) So this is for me and BigBox (1.1 Dual Titan Hybrid) a nice working feature. @Alex9779 maybe this is an update for your FW build too Code: #Marlin\Configuration_adv.h @@ -420,10 +420,10 @@ // does not respect endstops! #define BABYSTEPPING #if ENABLED(BABYSTEPPING) - #define BABYSTEP_XY //not only z, but also XY in the menu. more clutter, more functions + //#define BABYSTEP_XY //not only z, but also XY in the menu. more clutter, more functions //not implemented for deltabots! #define BABYSTEP_INVERT_Z false //true for inverse movements in Z - #define BABYSTEP_MULTIPLICATOR 1 //faster movements + #define BABYSTEP_MULTIPLICATOR 40 //faster movements, For BigBox 40 = 0.01mm #endif // @section extruder I'll be back...