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    why did my Printer melt?

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    • jay_s_ukundefined
      jay_s_uk
      last edited by

      If they're on from start up then the mosfet has failed due to more than likely a short in the wiring.
      Any pictures of the melted hot end?

      Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

      Killernoyundefined 1 Reply Last reply Reply Quote 0
      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        Which board? Firmware?

        Killernoyundefined 1 Reply Last reply Reply Quote 0
        • Killernoyundefined
          Killernoy @jay_s_uk
          last edited by

          @jay_s_uk it is disassembled right now but the Heater blocks are melted the ´last temp i saw before shut down were around 650 C

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          • Killernoyundefined
            Killernoy @Phaedrux
            last edited by

            @Phaedrux Duet2 Wifi with duex5 and RRF3

            Phaedruxundefined 1 Reply Last reply Reply Quote 0
            • Killernoyundefined
              Killernoy
              last edited by Killernoy

              IMG_20191217_163930.jpg
              One of the Heatblocks the thermistor is still in it but I had to rip the cable of because plastic was molten around it

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              • Phaedruxundefined
                Phaedrux Moderator @Killernoy
                last edited by

                @Killernoy said in why did my Printer melt?:

                RRF3

                which version specifically?

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                • Phaedruxundefined
                  Phaedrux Moderator @Killernoy
                  last edited by

                  @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?

                  Killernoyundefined 3 Replies Last reply Reply Quote 0
                  • Killernoyundefined
                    Killernoy @Phaedrux
                    last edited by

                    This post is deleted!
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                    • Killernoyundefined
                      Killernoy @Phaedrux
                      last edited by

                      @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

                      Killernoyundefined 1 Reply Last reply Reply Quote 0
                      • Killernoyundefined
                        Killernoy @Phaedrux
                        last edited by

                        @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?

                        3.0 beta12 2019-11-02b1

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                        • Phaedruxundefined
                          Phaedrux Moderator
                          last edited by

                          Is it still doing it? Can you get an M122 diagnostic report from it?

                          Killernoyundefined 1 Reply Last reply Reply Quote 0
                          • Killernoyundefined
                            Killernoy @Killernoy
                            last edited by

                            @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

                            Killernoyundefined 1 Reply Last reply Reply Quote 0
                            • Killernoyundefined
                              Killernoy @Phaedrux
                              last edited by Killernoy

                              @Phaedrux said in why did my Printer melt?:

                              Is it still doing it? Can you get an M122 diagnostic report from it?

                              Yes it is

                              === Diagnostics ===
                              RepRapFirmware for Duet 2 WiFi/Ethernet version 3.0beta12 running on Duet WiFi 1.02 or later + DueX5
                              Board ID: 08DGM-95BLL-N65TJ-6J9F4-3S46L-1JWVL
                              Used output buffers: 1 of 24 (1 max)
                              === RTOS ===
                              Static ram: 25812
                              Dynamic ram: 99608 of which 0 recycled
                              Exception stack ram used: 256
                              Never used ram: 5396
                              Tasks: NETWORK(ready,1448) HEAT(suspended,920) DUEX(suspended,160) MAIN(running,3652) IDLE(ready,200)
                              Owned mutexes:
                              === Platform ===
                              Last reset 00:00:43 ago, cause: power up
                              Last software reset at 2019-12-17 16:50, reason: Unknown, spinning module Webserver, available RAM 4992 bytes (slot 2)
                              Software reset code 0x40b2 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f80f BFAR 0xe000ed38 SP 0x20001ec4 Task 0x5754454e
                              Stack: 0044f28f 00450e22 81000000 00000000 40740000 3edb6db7 b7b4d800 3331bb4c 40000000 3f317200 b5ddea0e 388aa908 41e2ece8 00000000 00000000 00000000 00000000 00000000 40400000 80000010 00449277 00000001 004067db
                              Error status: 0
                              Free file entries: 10
                              SD card 0 detected, interface speed: 20.0MBytes/sec
                              SD card longest block write time: 0.0ms, max retries 0
                              MCU temperature: min 24.9, current 29.1, max 29.4
                              Supply voltage: min 0.3, current 0.5, max 0.6, under voltage events: 0, over voltage events: 0, power good: no
                              Driver 0: ok, SG min/max not available
                              Driver 1: ok, SG min/max not available
                              Driver 2: ok, SG min/max not available
                              Driver 3: ok, SG min/max not available
                              Driver 4: ok, SG min/max not available
                              Driver 5: ok, SG min/max not available
                              Driver 6: ok, SG min/max not available
                              Driver 7: ok, SG min/max not available
                              Driver 8: ok, SG min/max not available
                              Driver 9: ok, SG min/max not available
                              Date/time: 1970-01-01 00:00:00
                              Cache data hit count 132068223
                              Slowest loop: 0.76ms; fastest: 0.07ms
                              I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
                              === Move ===
                              Hiccups: 0, FreeDm: 169, MinFreeDm: 169, MaxWait: 0ms
                              Bed compensation in use: none, comp offset 0.000
                              === MainDDARing ===
                              Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
                              === AuxDDARing ===
                              Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
                              === Heat ===
                              Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
                              === GCodes ===
                              Segments left: 0
                              Stack records: 1 allocated, 0 in use
                              Movement lock held by null
                              http is idle in state(s) 0
                              telnet is idle in state(s) 0
                              file is idle in state(s) 0
                              serial is ready with "m122" in state(s) 0
                              aux is idle in state(s) 0
                              daemon is idle in state(s) 0
                              queue is idle in state(s) 0
                              autopause is idle in state(s) 0
                              Code queue is empty.
                              === Network ===
                              Slowest loop: 15.55ms; fastest: 0.00ms
                              Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0)
                              HTTP sessions: 0 of 8

                              • WiFi -
                                Network state is running
                                WiFi module is connected to access point
                                Failed messages: pending 0, notready 0, noresp 0
                                WiFi firmware version 1.23
                                WiFi MAC address 2c:3a:e8:0a:f2:1b
                                WiFi Vcc 3.41, reset reason Turned on by main processor
                                WiFi flash size 4194304, free heap 26096
                                WiFi IP address 192.168.178.77
                                WiFi signal strength -72dBm, reconnections 0, sleep mode modem
                                Socket states: 0 0 0 0 0 0 0 0
                                ok
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                              • dc42undefined
                                dc42 administrators
                                last edited by dc42

                                I'm sorry to hear of your misfortune. The only time I have heard of this happening before was when there was over-voltage on the +5V rail (due to a short to +12V or +24V) which resulted in failure of the mosfet driver chip. It's labelled U11 and it's close to the reset button and extruder heater mosfets. Does it look damaged?

                                Are you powering anything external to the Duet from the +5V supply? What fan voltage are you using?

                                Duet WiFi hardware designer and firmware engineer
                                Please do not ask me for Duet support via PM or email, use the forum
                                http://www.escher3d.com, https://miscsolutions.wordpress.com

                                Killernoyundefined 1 Reply Last reply Reply Quote 0
                                • Killernoyundefined
                                  Killernoy @dc42
                                  last edited by Killernoy

                                  @dc42 said in why did my Printer melt?:

                                  I'm sorry to hear of your misfortune. The only time I have heard of this happening before was when there was over-voltage on the +5V rail (due to a short to +12V or +24V) which resulted in failure of the mosfet driver chip. It's labelled U11 and it's close to the reset button and extruder heater mosfets. Does it look damaged?

                                  No it does not look damaged to me, but take a look for your self

                                  IMG_20191217_173121.jpg

                                  Are you powering anything external to the Duet from the +5V supply?

                                  The fans

                                  What fan voltage are you using?

                                  5V

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                                  • jay_s_ukundefined
                                    jay_s_uk
                                    last edited by

                                    U11 looks damaged to me. it has a hole in it

                                    Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                                    Killernoyundefined 1 Reply Last reply Reply Quote 0
                                    • Killernoyundefined
                                      Killernoy @jay_s_uk
                                      last edited by

                                      @jay_s_uk said in why did my Printer melt?:

                                      U11 looks damaged to me. it has a hole in it

                                      I don´t know if I´m right but to me it looks like a Texas Instruments LogoIMG_20191217_174953[1].jpg

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                                      • dc42undefined
                                        dc42 administrators
                                        last edited by

                                        U11 looks OK to me in that photo, but the symptom suggests to me that it has failed.

                                        As you are running 5V fans. I suggest you check very carefully that there is no possibility of a short between the fan wires and the hot end heater wires. We've seen users damage Duets before because of such shorts. That's why I argued (successfully) for us not to provide a jumper to select 5V fans on Duet 3 (OTOH, Duet 3 has a 12V regulator on board so that 12V fans can be used).

                                        Some fans and other devices (especially servos) pump power into the supply rail when they turn off, although in the case of small brushless fans, the smoothing capacitors on the supply rail should take care of that without excessive over-voltage.

                                        Duet WiFi hardware designer and firmware engineer
                                        Please do not ask me for Duet support via PM or email, use the forum
                                        http://www.escher3d.com, https://miscsolutions.wordpress.com

                                        Killernoyundefined 1 Reply Last reply Reply Quote 0
                                        • Phaedruxundefined
                                          Phaedrux Moderator
                                          last edited by

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                                          • Killernoyundefined
                                            Killernoy @dc42
                                            last edited by

                                            @dc42 I checked with a multimeter on continuity-mode one probe at the fan voltage select the other on the Heater out put screws one at a time. No short was found but strangely the 3V+ LED lit up

                                            dc42undefined 1 Reply Last reply Reply Quote 0
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