why did my Printer melt?

[zapta]

When running PID calibration Duet warns about the max reachable temperatures (~500-600C depending on the heater) and this thread suggests that those warnings should be taken seriously.

One option is to wire the Duet back to the power supply such it can turn it off (assuming the heaters are powered from the power supply), I think I will bump this up my TODO list.

A question for the OP, when this happened, did you see on the PanelDue a message indicating that the Duet detected the abnormal temperature and tried to turn off the heaters?

[Killernoy]

@zapta said in why did my Printer melt?:

When running PID calibration Duet warns about the max reachable temperatures (~500-600C depending on the heater) and this thread suggests that those warnings should be taken seriously.

I did not even come that far

One option is to wire the Duet back to the power supply such it can turn it off (assuming the heaters are powered from the power supply), I think I will bump this up my TODO list.

how do I do this?

A question for the OP, when this happened, did you see on the PanelDue a message indicating that the Duet detected the abnormal temperature and tried to turn off the heaters?

I don´t have a PanelDue

[DocTrucker]

@zapta it is certinally a nasty demonstration of what can go wrong and fortunately I think this is only about damage to the printer and nothing relating to secondary fires.

PS_ON has been available from year dot for Duets, and it has been on RAMPS too. The main use with these now is to allow the reliable cut of power to heaters in the event of a fault via mechanical relays not SSRs. The latters common failure mode is closed circuit on too, and if you read the Omron SSR docs they advise against their use in safety critical systems, whuch this clearly is. A pair of guided contact safety relays cutting the mains side of the of the PSU would be ideal, but a pair of them and bases and you've already spent a serious proportion of a cheap printer. I've got a comprimise at the moment. I found the four relay arduino boards can switch a DC current in excess of what my heater bed and nozzle take individually, so I've tied two relays in series for the bed, and for the hotend and used an inline fuse to protect the contacts.

Looking further ahead the passive safety isn't always practical, especially when you want to process hotter materials. We accept this everyday we drive since they got rid of the fella walking in front waving the flag. But if we exceed that passive safety limit we need to ensure we would need two or more things to go wrong before a dangerous situation occurs. With the hotends as they are it is difficult. Really we should have two thermistors and room for a thermal fuse, but that just isn't the case at the moment.

It's definately a work in progress for me and I'm not happy about leaving my printers unattended yet.

[zapta]

@Killernoy said in why did my Printer melt?:

how do I do this?

Search these forums for PS_ON, there are several discussions about it. I don't have personal experience with that signal yet.

DocTrucker@, I was thinking letting the Duet controlling the Remote Control input of my 24V power supply https://www.meanwell-web.com/content/files/pdfs/productPdfs/MW/RSP-500/RSP-500-spec.pdf . Also considering having a separate 5v power supply such that the duet stays alive after it cuts heaters power, or even just hooking a loud buzzer to the PS_ON output to at least let people around that something is bad.

Not sure how to proceed, need to spend some time reading what other people have done.

Edit: and maybe a fireball on each corner of my printer. It will look awesome. https://www.amazon.com/Fire-Extinguisher-Ball-self-activation-device/dp/B07D42CXWV

[Killernoy]

@DocTrucker said in why did my Printer melt?:

@zapta it is certinally a nasty demonstration of what can go wrong and fortunately I think this is only about damage to the printer and nothing relating to secondary fires.

Yes just Damage to the printer and my Hands as I tried to safe as many of the components while they were still hot.

[DocTrucker]

@Killernoy ouch, sorry to hear you're hurt but glad your house/building is ok. This sort of thing can leave you shaken a bit.

[Killernoy]

@DocTrucker said in why did my Printer melt?:

@Killernoy ouch, sorry to hear you're hurt but glad your house/building is ok. This sort of thing can leave you shaken a bit.

It is not that bad, but I'm happy to that my house is still standing.

[Killernoy]

@dc42 I should also mention that everything worked fine before the convertion to RRF3.

[dc42]

@Killernoy said in why did my Printer melt?:

@dc42 I should also mention that everything worked fine before the convertion to RRF3.

I very much doubt that it is related. If all the heaters turn on when you power up with no SD card inserted, then it's definitely a hardware fault.

[Killernoy]

@Killernoy said in why did my Printer melt?:

@Killernoy said in why did my Printer melt?:

@Phaedrux said in why did my Printer melt?:

@Killernoy said in why did my Printer melt?:

every heater output is set to 100% at startup?

Every heater was on full power at startup?

Yes

correction not every just Bed and E2 E3 and E6

@dc42 I corrected myself it's only Bed, E2, E3 and E6

I now checked it and without the sd every heater is off

[jay_s_uk]

@Killernoy is it because you have inverted your heater pins?
Try removing the ! From each M950 command and try again

[Killernoy]

@jay_s_uk said in why did my Printer melt?:

@Killernoy is it because you have inverted your heater pins?
Try removing the ! From each M950 command and try again

I will try that tomorrow thanks

[smoki3]

I miss a few things in your config:

• PID settings
• Max Temp protection (M143)

Also the bedheat, e0heat and e1heat do not have to be inverted on duet2. If you do, then the heaters are always on.

The two heaters on duex5 a correctly that they have to be inverted.

According to you config there is no E6. You just have defined four extruders.

I also noticed you have defined

M950 H0 (Bed)
M950 H1 (Tool0)
M950 H2 (Tool1)
M950 H3 (Tool2)
M950 H4 (Tool3)

but you create tools with:

M563 P0 H2
M563 P1 H3
M563 P2 H4
M563 P3 H5

So the heater mapping does not match. That means if you gcode tries to heat up tool 1 it will heat up tool 2.

So your config is really confusing and I think this is the main reason why something is melted. The looks like you have done some mistakes while conversion to RRF3.

You can look at my config how to define 4 tools (I just picked the lines which are related for the tools):

; Drives
M584 X0 Y1 Z2 E3:4:5:6 U7                          		; Map Drives to Axis
M669 K1                                            		; Select CoreXY mode
M569 P0 S0                                         		; Drive 0 goes forwards
M569 P1 S0                                         		; Drive 1 goes forwards
M569 P2 S1                                         		; Drive 2 goes forwards
M569 P3 S0                                         		; Drive 3 goes forwards
M569 P4 S0                                         		; Drive 4 goes forwards
M569 P5 S0                                         		; Drive 5 goes forwards
M569 P6 S0                                         		; Drive 6 goes forwards
M569 P7 S0                                        		; Drive 7 goes forwards
M350 X16 Y16 Z16 E16:16:16:16 I1                   		; Configure microstepping with interpolation
M350 U8 I0					   		; Configure microstepping without interpolation
M92 X100 Y100 Z1600 U100 E460:460:460:460          		; Set steps per mm
M566 X600 Y600 Z18 U2 E100:100:100:100         		   		; Set maximum instantaneous speed changes (mm/min)
M203 X35000 Y35000 Z1200 U25000 E5000:5000:5000:5000    	; Set maximum speeds (mm/min)
M201 X6000 Y6000 Z400 U500 E2500:2500:2500:2500         	; Set accelerations (mm/s^2)
M906 X1650 Y1650 Z1100 U200 E1450:1450:1450:1450 I30    	; Set motor currents (mA) and motor idle factor in per cent
M84 S120                                           		; Set idle timeout
 
; Thermal Sensors
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950                   	; Set thermistor + ADC parameters for heater 0
M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.060000e-8       	; Set thermistor + ADC parameters for heater 1
M308 S2 P"e1temp" Y"thermistor" T100000 B4725 C7.060000e-8       	; Set thermistor + ADC parameters for heater 2
M308 S3 P"e2temp" Y"thermistor" T100000 B4725 C7.060000e-8      	; Set thermistor + ADC parameters for heater 3
M308 S4 P"e3temp" Y"thermistor" T100000 B4725 C7.060000e-8      	; Set thermistor + ADC parameters for heater 4
 
; Hardware
M950 H0 C"bedheat" T0
M950 H1 C"e0heat" T1
M950 H2 C"e1heat" T2
M950 H3 C"!exp.heater3" T3
M950 H4 C"!exp.heater4" T4
 
; Max Temp Protection
M143 H0 S140                                   ; Set temperature limit for heater 0 to 140C
M143 H1 S270                                   ; Set temperature limit for heater 1 to 270C
M143 H2 S270                                   ; Set temperature limit for heater 2 to 270C
M143 H3 S270                                   ; Set temperature limit for heater 3 to 270C
M143 H4 S270                                   ; Set temperature limit for heater 4 to 270C
 
; Tools
M563 P0 D0 H1 F0                               ; Define tool 0, Fan 0
M563 P1 D1 H2 F3                               ; Define tool 1, Fan 3
M563 P2 D2 H3 F7                               ; Define tool 2, Fan 7
M563 P3 D3 H4 F5                               ; Define tool 3, Fan 5
 
; PID Settings Tools
M307 H1 A595.9 C199.5 D4.5 S1.00 V24.1 B0      ; Set PID settings tool 0
M307 H2 A775.0 C252.4 D8.2 S1.00 V24.1 B0      ; Set PID settings tool 1
M307 H3 A716.5 C237.1 D8.7 S1.00 V24.1 B0      ; Set PID settings tool 2
M307 H4 A567.7 C241.0 D6.7 S0.80 V24.1 B0      ; Set PID settings tool 3
M307 H0 A181.4 C631.5 D4.9 S1.00 V24.1 B0      ; Bed PID Settings
 
; Tooloffset
G10 P0 X0.00 Y34.50 Z-15.84                    ; Set tool 0 axis offsets
G10 P1 X0.55 Y34.50 Z-15.83                    ; Set tool 1 axis offsets
G10 P2 X0.16 Y34.50 Z-15.85                    ; Set tool 2 axis offsets
G10 P3 X0.25 Y34.50 Z-15.70                    ; Set tool 3 axis offsets
 
; Tools Temperatures
G10 P0 R0 S0                                   ; Set initial tool 0 active and standby temperatures to 0C
G10 P1 R0 S0                                   ; Set initial tool 1 active and standby temperatures to 0C
G10 P2 R0 S0                                   ; Set initial tool 2 active and standby temperatures to 0C
G10 P3 R0 S0                                   ; Set initial tool 3 active and standby temperatures to 0C
 

[zapta]

@jay_s_uk said in why did my Printer melt?:

@Killernoy is it because you have inverted your heater pins?

This looks like a winner. Like swapping the gas and brakes pedals in a car.

[dc42]

@smoki3 said in why did my Printer melt?:

; Hardware
M950 H0 C"bedheat" T0
M950 H1 C"e0heat" T1
M950 H2 C"e1heat" T2
M950 H3 C"!exp.heater3" T3
M950 H4 C"!exp.heater4" T4

Although that will work, if you are using a DueX to provide heaters 3 and 4 then I would use this instead:

M950 H0 C"bedheat" T0
M950 H1 C"e0heat" T1
M950 H2 C"e1heat" T2
M950 H3 C"duex.e2heat" T3
M950 H4 C"duex.e3heat" T4

You don't need to invert any heater pins if you use the actual pin names that you connect the heaters to.

[Killernoy]

I´m going through the configuration tool in order to avoid any further Problems

Thanks again to everyone that gave me advise for software.

[Killernoy]

I´m now set up with the config from the Tool, but the E6 LED is still lit up is this because i have my BLTouch on PWM5?

[dc42]

@Killernoy said in why did my Printer melt?:

I´m now set up with the config from the Tool, but the E6 LED is still lit up is this because i have my BLTouch on PWM5?

Yes.

[Killernoy]

Ok Thanks