I'm posting this in hopes someone else will learn from my trials.

I have a home designed and built Prusa i3 derivative using aluminum extrusions for rigidity. As such, it has dual Z motors.

I had been trying to get the auto dual Z leveling working and just kept getting errors or each time I tried, the bed would get more out of level. I disabled it for a while in frustration.

Tonight, I went back to look at it again. Same results. The bed would just get more unlevel every time. I was just sitting staring at it and it finally hit me what was wrong. My dual Z motors are run off separate drivers (Drivers 2 and 4), not ganged together in the dual Z plug (Drivers 2 and B). When I built it, I paid no attention to which motor was in 2 and which was in 4. Many of you will just say "DUH!" but, again, I'm hoping this helps someone out. I had them reversed between 2 and 4. The software was working but sending the correction to the opposite motor, therefore making it worse. Face palm. I reversed them and all is well now and auto Z leveling works great.

@Phaedrux said in Thermostatic hotend fan issue:

Do you see any damaged little chips near the fan ports?

For example:
https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_Fan_mosfet

I see a telltale black dot on TR9. Looks like I'm going to have to switch to always-on fans from now on with this printer. Oh well. Not the end of the world. I'll probably just have the always-on port switch on a relay to isolate the board from the fans.

Duet2Wifi
Firmware: 2.02(RTOS) (2018-12-24b1)
Power supply: 24v

This is odd and has me scratching my head. My printers has hundreds of hours of printing. Up until now, the hotend fan was thermostatically controlled to turn on at 45. Now, it won't come on. I've verified that I have good continuity in the wiring. I have the following in my config file:

M106 P1 T45 H1

The fan is connected to Fan1 on the board. If I connect the fan to Fan2 on the board and configure it to P2 in M106, the fan just stays on no matter what the temp. Also, if I connect a voltmeter to Fan1, it constantly reads 24v yet won't power any fan hooked up to it (yes, I checked polarity to the fan).

What is going on here? I've seen reference to M950 in some posts. I've never had one. Needed?

Thanks. All is good now.

Yup, that got it. I had done all of that before in that order minus the G4 line. What did that do?

While mid print, my wifi connection to the Duet disconnected. I was unable to reconnect even after turning off and starting the wifi module via the PanelDue. When I start the machine, the blue wifi LED blinks very briefly then goes out.

I reinstalled the firmware for the DuetWifi itself, Wifi server, and web control. I've reset the Wifi with M552 S-1.
When I connect via the Machine control in Simplify 3D, I get:
"Wifi reported error: no known networks found"
"Wfif module is idle"
When I issue M587 S"" P"" (with my info), I get:
"M587: Failed to add SSID to remembered list"
Followed shortly by:
"Error Retrieving WIFI status message: Bad reply format Version"

If I run a M588 with my network info, I get:
"M588: Failed to remember SSID to remembered list"

I'm running Firmware 2.05.1

Dead Duck? Thoughts?

Homeall.g

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool on Thu Apr 13 2017 15:10:04 GMT-0700 (MST)

; Relative positioning
G91

; Lift Z
G1 Z5 F6000 S2

; Course home X and Y
G1 X-235 Y215 F3600 S1

; Move away from the endstops
G1 X5 Y-5 F6000

; Fine home X and Y
G1 X-500 F2500 S1
G1 Y500 F2500 S1

; Dual Z Homing
M584 Z2 U3
G1 S1 Z500 U500
M584 Z2:3 U9

; Absolute positioning
G90

; Tell the firmware where we are
G92 Z400.5

G0 Z390

Duet Wifi Firmware version 2.02(RTOS) (2018-12-24b1)

Config.g

; Configuration file for Duet WiFi

; Communication and general
M111 S0 ; Debug off
M550 PDarthVader ; Machine name (can be anything you like)
M551 PXXXX ; Machine password (currently not used)
M552 S1 ; Enable WiFi
M555 P2 ; Set output to look like Marlin
M575 P1 B57600 S1 ; Set auxiliary serial port baud rate and require checksum (for PanelDue)

; Axis and motor configuration
M584 X0 Y1 Z2:3 E4 P3 ; Dual Z Homing
M671 X-60:460 Y200:200 S10 ; leadscrews offset for leveling
M569 P0 S0 ; Drive 0 goes forwards (change to S0 to reverse it)X Axis
M569 P1 S1 ; Drive 1 goes backwards Y Axis
M569 P2 S0 ; Drive 2 goes forwards Z Axis
M569 P3 S0 ; Drive 3 goes forwards
M569 P4 S0 ; Drive 4 goes forwards
M350 X16 Y16 Z16 E16 I1 ; set 16x microstepping with interpolation

; Endstops
M574 X1 Y2 Z1 S1 ; set homing switch configuration (Y homing switch only, at low end, active high)

M906 X800 Y800 Z1275 U1275 E600 ; Set motor currents (mA)

M143 S300 ; Set max temp

; Motion
M564 H0 ; 1/9/19 If you want to allow axis movement prior to homing
M201 X2000 Y2000 Z100 U100 E1000 ; Accelerations (mm/s^2) - test
M203 X180000 Y180000 Z240000 U240000 E3600 ; Maximum speeds (mm/min)
M566 X900 Y900 Z30 U30 E1200 ; Maximum jerk speeds mm/minute - Current 1/9/19

; Homing
M208 X390 Y380 Z400.5 ; set axis maxima and high homing switch positions (adjust to suit your machine)
M208 X0 Y0 Z-0.5 S1 ; set axis minima and low homing switch positions (adjust to make X=0 and Y=0 the edges of the bed)

M92 X80.48 Y80.48 Z398.6975 U398.6975 ; set axis steps/mm
M92 E389.5 ; set extruder 0 and 1 steps/mm
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

; Pressure Advance
M572 D0 S0.1

; Mesh Compensation
G29 S1

; Thermistors
M305 P0 T100000 B4550 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M305 P1 B4725 C7.06e-8 ; Regular E3Dv6 Thermistor - Set thermistor + ADC parameters for heater 1
; M305 P1 X200 ; PT100
M570 H1 P20 T60 ; Hot end 1. Persist 5. Temp variance 15.

; Fans
M106 P1 T35 H1 ; thermostatic mode for fan 1 - turns on at 35C

; Tool definitions
M563 P0 D0 H1 ; Define tool 0
G10 P0 S0 R0 ; Set tool 0 operating and standby temperatures

; Z probe and compensation definition
M307 H3 A-1 C-1 D-1
M557 X40:360 Y40:360 S100 ; probe from X=40 to 360, Y=40 to 360mm with a mesh spacing of 80mm
M558 P9 X0 Y0 Z1 H15 F300 T5000

G31 X17 Y-27 Z1.2 P25 ; More Z = closer

M208 S1 Z-0.2 ; set minimum Z
;
T0 ; select first hot end

; Configure heater fault detection
M570 H1 P10 T15

I have a home designed and built printer. It has a build volume of 400x400x400mm. It uses dual lead screws for the Z axis. When I tell it to home Z, the bed drops to the bottom to engage dual z stops. The problem I have is the the right side lags behind the left. It takes a couple seconds for the right side to catch up to the left side to engage the right side limit switch. During normal Z movement, there is no lag. I can start at the bottom, command it to go to Z0, and it goes up evenly. If I then command it to go back down to Z400, it goes down evenly. If I put a digital level on the bed during these transits, the angle stays the same. It only happens when homing. I've verified that the power, steps, max speed, accel, and jerk are all the same settings for the Z and U axis. The lead screws are free. Without power, the bed will settle to the bottom on its own so its not a binding issue. Thoughts?

@dc42 said in Printer starting to act odd after firmware update.:

@speedydad said in Printer starting to act odd after firmware update.:

I updated all the firmware. All seemed well until tonight. It was printing fine, then just stopped. I looked over and saw the wifi startup message. The DuetWifi had restarted itself. No console errors. Just a disconnect from the restart.

If that happens again, run M122 immediately. Look at the "Last reset reason" in the report. If it was Software, post the Software Reset Data here. If it was Power Up, you probably had a power brownout.

I ran it just now and got:
Last software reset at 2019-01-16 21:11, reason: Hard fault, spinning module Platform, available RAM 6336 bytes (slot 0)
Software reset code 0x4030 HFSR 0x40000000 CFSR 0x00000400 ICSR 0x04427003 BFAR 0xe000ed38 SP 0x2001ffbc Task 0x4e49414d

that is about the time it reset. Not 100% sure that was it but pretty sure

It is not. I guess I could try running a wire from the power supply ground to the frame to see if it fixes these issues.