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    Solved Hot end auto-tuning keeps failing

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    • twistedfab13
      twistedfab13 last edited by

      I have tried the following:
      Warning: Auto tune of heater 1 failed due to bad curve fit (G=3862.3, tc=234.1, td=4.7)
      5:08:02 PM Auto tune phase 3, peak temperature was 319.1
      5:07:51 PM Auto tune phase 2, heater off
      5:07:28 PM Auto tune phase 1, heater on
      5:07:22 PM M303 H1 S260
      Auto tuning heater 1 using target temperature 260.0°C and PWM 1.00 - do not leave printer unattended

      Warning: Auto tune of heater 1 failed due to bad curve fit (G=4150.7, tc=238.4, td=4.0)
      5:30:39 PM Auto tune phase 3, peak temperature was 296.3
      5:30:29 PM Auto tune phase 2, heater off
      5:30:07 PM Auto tune phase 1, heater on
      5:30:02 PM M303 H1 S245 ;
      Auto tuning heater 1 using target temperature 245.0°C and PWM 1.00 - do not leave printer unattended

      Warning: Auto tune of heater 1 failed due to bad curve fit (G=4516.7, tc=229.2, td=3.5)
      5:47:32 PM Auto tune phase 3, peak temperature was 263.8
      5:47:21 PM Auto tune phase 2, heater off
      5:47:03 PM Auto tune phase 1, heater on
      5:46:57 PM M303 H1 S210;
      Auto tuning heater 1 using target temperature 210.0°C and PWM 1.00 - do not leave printer unattended

      5:56:37 PM M303
      Heater 1 tuning failed

      All of the temps I have tried have 3 different temps with the same result.
      Am I doing something wrong?

      1 Reply Last reply Reply Quote 0
      • JamesM
        JamesM last edited by

        It looks like what happens when someone uses a 12volt heater cartridge with a 24volt power supply. I have seen a few people do that with their Ender 3 printers since they didn't know it was a 24volt system and they purchased what is used on a CR-10 printer which is 12 volts.

        1 Reply Last reply Reply Quote 1
        • twistedfab13
          twistedfab13 last edited by twistedfab13

          Makes sense. It is getting to temp really really fast. So if I have a 24V PSU how do I get 12V to the hotend? I have a 24V to 12V converter but I wouldn't think it could takes 4 or so amps. Do I need a 24V cartridge?

          1 Reply Last reply Reply Quote 0
          • fcwilt
            fcwilt last edited by

            Just get 24 volt heaters - they are cheap.

            Frederick

            Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

            1 Reply Last reply Reply Quote 1
            • twistedfab13
              twistedfab13 last edited by

              Just ordered one. Thanks for the help.

              1 Reply Last reply Reply Quote 0
              • DocTrucker
                DocTrucker last edited by

                Does the temperature profile look rough? I've had that error from a failing thermistor. I imagine it could also be made from bad connections making intermittent fluctuations in temperature.

                Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

                1 Reply Last reply Reply Quote 0
                • twistedfab13
                  twistedfab13 last edited by

                  It curve starts out vertical because of the 12V heater cartridge. Also, Overshoots about 30 degs. because the voltage is doubled. Found a 24V cartridge in my box of misc parts. The curve is more gradual on heating and now I get a different warning.

                  10:43:35 AM Warning: Heater 1 appears to be over-powered. If left on at full power, its temperature is predicted to reach 514C.
                  Auto tune heater 1 completed in 226 sec
                  Use M307 H1 to see the result, or M500 to save the result in config-override.g
                  10:41:14 AM Auto tune phase 3, peak temperature was 202.5
                  10:41:07 AM Auto tune phase 2, heater off
                  10:39:55 AM Auto tune phase 1, heater on
                  10:39:49 AM M303 H1 S195;
                  Auto tuning heater 1 using target temperature 195.0°C and PWM 1.00 - do not leave printer unattended

                  Stephen6309 1 Reply Last reply Reply Quote 0
                  • Stephen6309
                    Stephen6309 @twistedfab13 last edited by

                    @twistedfab13 That over-powered warning is an informational warning.

                    1 Reply Last reply Reply Quote 0
                    • twistedfab13
                      twistedfab13 last edited by

                      Yah, It seems to be working now. Save using an M500. Now trying to do a first print. The Z says 0.3 but the nozzle is a good 5 mm above.

                      Phaedrux 1 Reply Last reply Reply Quote 0
                      • Phaedrux
                        Phaedrux Moderator @twistedfab13 last edited by

                        @twistedfab13 https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Homing_Z

                        Z-Bot CoreXY Build | Thingiverse Profile

                        1 Reply Last reply Reply Quote 0
                        • twistedfab13
                          twistedfab13 last edited by

                          Yah figured it out. Was doing the mesh compensation. When I looked at the mesh it was really bad and all over the place. Long story short the fan cable was too close to the probe and it was registering all the time. LOL. Quick fix and now the test print it laying down correctly.

                          Thanks for the help!!

                          1 Reply Last reply Reply Quote 0
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