Unexpected token a in JSON at position 251

[jay_s_uk]

What issues were you having when you upgraded to RRF3?

[curlypaul]

@jay_s_uk I haven't tried RRF3 yet, But with 2.05 and 2.04 my second set of motors didn't move as expected
in this post here...
link text

[jay_s_uk]

have you thought about trying a newer version of DWC? I believe 2.07 should work ok.
If you don't like it, you can easily go back to 1.22.6 as well.

[dc42]

@curlypaul said in Unexpected token a in JSON at position 251:

@jay_s_uk I haven't tried RRF3 yet, But with 2.05 and 2.04 my second set of motors didn't move as expected
in this post here...
link text

I can't tell from that thread what actually changes when you upgrade from 2.02 to 2.05. Please start a new thread about that, and include the config.g and homing files that work with 2.02 in that thread.

[curlypaul]

@dc42
When i get it up and ruuning again I will certainly do that with the seperate thread.

Still the same issue with DWC 2.07...
Checked through config.g to see if messed anything, but literally all i changed were E steps/mm

[jay_s_uk]

can you get an output of M122? It would be interesting to see what your wifi signal is

[curlypaul]

@jay_s_uk
M122 dump is in the second post.
It's about 3m away from Unifi access point, i have another printer (duet) right next to this printer running ok

[jay_s_uk]

Missed that.
-46db is perfectly fine so that's not the issue.
Best to follow dc42's advice and work out where the issues lie when upgrading from 2.02 to 2.05.1

[deckingman]

@curlypaul said in Unexpected token a in JSON at position 251:

Checked through config.g to see if messed anything, but literally all i changed were E steps/mm

Long shot here but logically, if all you did was edit something in config.g, then the issue must either be something to do with that edit, or it's just an unfortunate co-incidence. If it was me, I would comment out the line that was edited, then carefully type it again. Just in case a hidden character has crept in somewhere that is screwing things up. Maybe post your config.g just in case one of us can spot something that you might have missed.

[curlypaul]

I changed the E steps on second extruder from 802, to 401 as swapped from 0.9 to 1.8deg motor

M584 X3 Y4 Z2 E7:6 U0 V1 P4                       		; set drive mapping
M350 X16 Y16 U16 V16 Z16 E16:16 I1                  		; configure microstepping with interpolation
M92 X160 Y160 U160 V160 Z2560 E402:401   			; set steps per mm
M566 X1200 Y1200 U1200 V1200 Z25 E2500:2500			; set maximum instantaneous speed changes (mm/min)
M203 X20000 Y20000 U20000 V20000 Z600 E9000:9000		; set maximum speeds (mm/min)
M201 X1000 Y1000 U1000 V1000 Z500 E3000:3000      		; set accelerations (mm/s^2)
M906 X1200 Y1200 U1200 V1200 Z1500 E900:E900 I30   		; set motor currents (mA) and motor idle factor in per cent
M84 S60                                         		; Set idle timeout

[curlypaul]

Deleted the lot and typed it all in again

Working now

Goodness knows what that was all about

Thankyou to those that chipped in

[dc42]

@curlypaul said in Unexpected token a in JSON at position 251:

Deleted the lot and typed it all in again

Working now

Goodness knows what that was all about

Thankyou to those that chipped in

I recall that a few RRF versions ago, I fixed a bug which caused invalid JSON to be generated in some configurations. Looks like you hit it.

[curlypaul]

@dc42 - thanks i think !?

I kind of hope i 'hit 'it' in a way