@dc42 good to know , thanks

@phaedrux Awesome .Thats exactly what i wanted to know. Thanks . Im using 2 motors/leadscrews btw .Also the direct mount titan/bltouch carriage for the D-bot

Just bought a Duet Wifi (first time using Reprap firmware coming from marlin) . Setting it up for the first time .It will be on my new D-Bot corexy build. Just updated it to firmware 1.21 Have a couple questions on the BLtouch smart probing(Using heater 3 for the BLtouch).

What is the difference between Automatic bed leveling and mesh leveling ?

What i want it to is the first time run all the probing points and save the mesh map so then after when i go to print it will just home/probe the center of the bed and print with compensation using the saved bed map.

I made a macro for the mesh leveling
G91
G1 Z6 F200
G90
M98 Pdeployprobe.g
G29 S2
M557 X30:220 Y35:285 S40 ; Define mesh grid
G29
M98 Pretractprobe.g

For the config.g and bed.g im not sure what to do ,if i should have G29 or G30 ? Right now it looks like this

Config.g
; Z-Probe
M307 H3 A-1 C-1 D-1 ;Disables Heater 3 to free up pwm channel by ACD-1 ,positive turns on
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 X0 Y0 Z1 H4 F450 T4000 ; Set Z probe type to unmodulated and the dive height + speeds
G31 P1 X-25 Y-31 Z1.5 ; Set Z probe trigger value, offset and trigger height
M557 X30:220 Y35:285 S40 ; Define mesh grid

Bed.g
; bed.g
; called to perform automatic bed compensation via G32
;
; generated by RepRapFirmware Configuration Tool on Mon Apr 23 2018 02:58:33 GMT-0400 (Eastern Daylight Time)
M561 ; clear any bed transform
G28 ; home all axes
M98 Pdeployprobe.g ; deploy mechanical Z probe
; Probe the bed at 5 points
G30 P0 X30 Y35 H0 Z-99999
G30 P1 X30 Y285 H0 Z-99999
G30 P2 X220 Y285 H0 Z-99999
G30 P3 X220 Y35 H0 Z-99999
G30 P4 X125 Y160 H0 Z-99999 S
M98 Pretractprobe.g ; retract mechanical Z probe

Am i doing this right to get what i want? Should i only have one point there instead of 5 and will it use the previously created mesh?

Also last question.On a D-bot corexy is the z offset positive or negative. Like is it 0 at the bed and as the bed moves down its positive?