precise bed leveling knob (wheel) for M3 screw

precise bed leveling knob (wheel) for M3 screw
now in two versions: simple V1 and more precise V2
you need the M3 nut for it
it was designed for Anycubic I3 Mega but it is universal for use with any machine
it is about 40 mm diameter
one full turn equals 0.50 mm bed movment
scale: -> bed movment V.1
1 dash medium -> 0.02 mm
1 sector -> 0.10 mm
1 full turn (5 sectors) -> 0.5 mm

scale: -> bed movment V.2
1 dash small -> 0.01 m