Duet 2 Wifi + BLtouch issues on Ender 5 pro

Phaedrux

If the 228 came from sending G1 H3 X400 from the 0,0 position then it's measuring the distance between the nozzle being at 0,0 and when the endstop triggers, which is your reachable area. Are you saying you could jog beyond 228?

alxndr

@Phaedrux I cannot jog past that point physically but I'm wondering why that numbet is different from the actual measurement

alxndr

@Phaedrux oh wait...the x cant go ALL the way to the left because of the bltouch!!

now last thing...trying to set 4 probing points....using this: M557 X20:208.8 Y20:203.5 P4

But it only probes 3 points? the results in the console say "probed 12 points" but its actually probed 9...any ideas with that?

mitch

@alxndr I have an ender5 Pro as well modified with BL-Touch and Duet2. It looks like you are getting close to resolving your issues.

I have archived my configuration here:
https://github.com/kiowadriver/Duet2Ender5Hemera

I have also archived my mods here:
https://www.randoprojects.com/2020/07/26/ender-5-mainboard-upgrade/

When adding the Duet2 I took an opportunity to update the wiring scheme to use twisted pairs to reduce stepper noise so the configuration on motor direction could be different. I would be happy to share more Ender5 configs if you find it helpful.

alxndr

@mitch Thanks for this! i think im pretty much set right now. The only thing im messing with is the bltouch probing points. I'm having a little trouble with that....trying to get 4 points to probe but it keeps telling me it cant reach the points. i basically set start at x10 and end at my limit which is x228.8 but i realize thats for the nozzle...not the bltouch. so im not sure how exactly im supposed to set that.....

mitch

@alxndr My direct drive Hemera and BLtouch change the limits. The steps described by @Phaedrux will work. He helped me get up and running when I converted my Ender 5 Pro.

Just as an example, here is my config. g settings you can see from github:

; Axis Limits
M208 X220 Y207 Z300 S0                                 ; set axis maxima

; Define Mesh
M557 X0:180 Y40:195 S40                                ; define mesh grid

I have 40mm spacing (S40).

Total points probed = 20
4 x 5 grid

The four corners probed end up being:

(0,40)               (0,160)

(160,40)             (160,160)

I have been specifying the distance between probe points (S40) but it looks like the P parameter would be more useful as it calculates the distance for you given a specified number of points and a defined limit. I may try to swap over to that method myself.

alxndr

@mitch just out of curiosity, how and where in comparison to your nozzle is your bltouch mounted?

mitch

@alxndr that is also defined in the config.g I posted. It is in the G31 setting for X and Y offsets.

; Z-Probe
M950 S0 C"exp.heater4"                                 ; create servo pin 0 for BLTouch
M558 P9 C"zprobe.in+zprobe.mod" H5 F120 T6000          ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-43 Y3 Z2.0431                               ; set Z probe trigger value, offset and trigger height
M557 X0:180 Y40:195 S40                                ; define mesh grid

alxndr

@mitch I don't get how we have the same printer and yet we have different values for axis limits.

mitch

I have a hemera direct drive extruder w/ BLtouch. You have a stock bowden extruder. You just need to go find the limits you have with your BLtouch setup and change the values.

IMG_20200726_204136 (1).jpg

Phaedrux

If you want to probe 4 points change your M557 from using S40 which is spacing between points to P4 which is probe 4 points and figure out the spacing automatically.

alxndr

@Phaedrux so I did that. But it only probes 3 while saying it can't reach some points.

alxndr

@mitch would you happen to have an example of start and end gcodes that i could look at? im trying to set mine right now. Thanks!

alxndr

@Phaedrux hey again! would you have any suggestions for start and end gcode? this is probably the very last thing i have to do until i can finally print. thanks!

Phaedrux

stop.g start.g

Phaedrux

@alxndr said in Duet 2 Wifi + BLtouch issues on Ender 5 pro:

But it only probes 3 while saying it can't reach some points.

Adjust your M557 grid based on your M208 size and your G31 probe offset.

If it's saying it can't reach a point, it's because it physically can't get the probe there. So move that point further in where the probe can reach.