Solved 3.4b4 and 3.4b5 – issue with sensorless homing

[Fred-Y]

Hi,

I updated today my 2 CoreXY to 3.4b5 from 3.4b3 and immediately noticed that the sensorless homing is not working anymore on both printers.

I rolled back to 3.4b3, it works; Installed 3.4b4 is doesn’t work.
I checked the change log for b4 and b5 but I haven’t noticed any changes related this issue; I have also not found any post related

Configuration:

• CoreXY
• Duet 3 6HC + 1LC (v1 on the first printer and v1.1 on the other)
• Steppers 1.8 on the first printer and .9 on the second
• both 24v

Issue:
When I try to home X or Y it seems the stall detection is triggered immediately – there is no movement in the X or Y max (these 2 printers home on X/Y max).
I can do a quick video if unclear.

I have attached the different files that might contain useful details from the printer with the 1.8 steppers.

config.g
homex.g

default-config.g
sensorless_setting.g

m122.txt

I haven’t tried yet to adjust the settings to “fix” the issue, I will likely spend some time later.
Let me know if there is any adjustments or test you would like me to do.

Thanks!

[dc42]

@fred-y I have one other report of a similar issue. My own CoreXY running 3.4beta5 is working with sensorless homing. I had to increase the M915 S parameter by 1 recently, which I thought was because I changed the control board; however I changed the firmware to 3.4beta5 at about the same time.

I will investigate whether there was a change between beta4 and beta5.

[Fred-Y]

@dc42 Thank you for the prompt response.
To clarify, the issue started to happen on beta4 and is as well on beta5.

I did a quick test and I bumped the M915 S parameter gradually from 10 to 60, it didn't make any changed - Same with lower values which makes sense as it increase the sensitivity but I wanted to try.

I have also increased the current (M913) up to 100 it has not make any difference.

I even pushed the carriage to "help" and unfortunately the result is the same.

If I execute a macro with this code

G91
G1 X20 F1200 H2
G1 X-20 H2
G1 Y20 H2
G1 Y-20 H2
G90

each motor moves individually and smoothly.

[dc42]

@fred-y please try the new binary at https://www.dropbox.com/sh/xeu30go894p9xbs/AAB5U66SH4wbjKIcX0snUbKxa?dl=0.

[Fred-Y]

@dc42 Good news, I loaded this version on my 2 CoreXY and sensorless homing is working like before with the original parameters

I will try to run some prints on them today / this weekend and report any issue found.

[Fred-Y]

@dc42 I think this topic can be flagged as resolved, I did many small prints today and I have zero issue - Everything worked perfectly!

Thank you for the prompt fix!