Heater Fault - Using old style E3D v6 hotend
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It sounds to me that the heater is under-powered. Might you be using a 24V heater cartridge on a 12V system?
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It sounds to me that the heater is under-powered. Might you be using a 24V heater cartridge on a 12V system?
The heater and power supply are both 12v
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One final thing to check. As you've changed the thermistor, have you got the correct values in M305 for that new thermistor? The only other possibility that I can think of is that it might be the cartridge itself. Do you have another that you can try?
You could try setting a lower target temperature but it's a bit like having a warning light appear on the dashboard of your car, and putting a bit of tape over it. It hides the warning but the underlying problem is still there.
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Well the new thermistor is 100k ohm, same as the thermistor cartridge. Also, the ir thermometer I have says it's accurate to within 5 degrees, so probably just tolerance difference.
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My config file doesn't have a M307 line, are the values on http://reprap.org/wiki/G-code#M307:_Set_or_report_heating_process_parameters worth using?
Sorry if these are dumb questions - not much software experience…
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I'm not sure what default values duet uses but they should be "good enough". Run M307 without any parameters and it will report what is in use. If the gain (the "A" value) is low, you could try setting it higher.
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I sent a M307, didn't get anything back… Probably the problem then?
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Sorry my bad. You need to add the heater number. H0 is the bed and H1 is the first hot end, so M307 H1 should report what's in use.
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Should have tried that myself, no worries.
SENDING:M307 H1
Heater 1 model: gain 340.0, time constant 140.0, dead time 5.5, max PWM 1.00, mode: PID
Computed PID parameters for setpoint change: P13.4, I0.095, D51.4
Computed PID parameters for load change: P13.4, I0.949, D51.4Is there anything wrong here? Reaally don't know what I'm looking for
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Those number don't look far out IMO - not enough to cause the problems you are having. Everything is pointing to your heater block as that's the only other thing you have changed and it's after that change that things went awry. It's possible that you have a "lazy" heater cartridge. Do you have spare you can try? One other thing, can you hands on any copper grease? If you coat the heater cartridge in that, it will help thermal transfer between the cartridge and the block. Just a thought…..
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I've not got a spare heater cartridge, will try the copper grease. If that doesn't work, what bodge could I do to just stop the software worrying about the time taken to heat up? Rather not order another new heater cartridge…. (again I'm cheap/broke)
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If that doesn't work, what bodge could I do to just stop the software worrying about the time taken to heat up?
Like I said, that would be like putting a bit of sticky tape over a warning light on your car dashboard. It will hide the warning light but the problem still exists. You could for example send M302 to enable cold extrude but it still won't print.
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So there's no way of changing the expected rate of heat increase? I can't tell the printer I expect it to rise by at least 0.5 deg/s instead of 1.7?
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So there's no way of changing the expected rate of heat increase? I can't tell the printer I expect it to rise by at least 0.5 deg/s instead of 1.7?
I don't know of one personally. You could try increasing the heater fault detection time and or temperature excursion limits -see here https://duet3d.com/wiki/G-code#M570:_Configure_heater_fault_detection. That may allow you to print in some sort of fashion. I think (but I'm not sure) that you would still see an error if you tried to tune the heater).
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Ok, I think I'm going to bite the bullet and get some kit from the e3d site. Thanks for the help.
