PID Hotend Autotune - How Long?
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Photo of your hotend? It may be expecting to see a drop from the fan, but it's not happening.
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@Adamfilip said in PID Hotend Autotune - How Long?:
Does it matter what idle temp the hotend is before you start this?
It should be from ambient.
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My Cooling is excessive when turned onto full, that's why I'm doing to Autotune as I had a 15 degree drop and It faulted during my last print
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Are you controlling the fan yourself during the tune with M303 T0?
You should leave the fan off and the firmware will turn it on when needed.
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I not manually controlling it. it was set to off and nozzle temp was ambient last time I tried (running now.. 1.5hrs in so far)
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You're tuning to 220 and it's steady at 218. Try tuning to 215.
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ok will attempt
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is there way to limit power to fan so 100% is just actually 50% power?
M950 F0 C"fan0" Q100
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@Adamfilip said in PID Hotend Autotune - How Long?:
is there way to limit power to fan so 100% is just actually 50% power?
When you configure the fan in config.g using m106, use the "X" parameter. For example, M0.5 will tell RRF that when the fan is set to 100% via "M106 S1" (or M106 S255), it actually only runs at 50%.
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When I ran M303 T0 S215
I finally got this resultWarning: heater behaviour was not consistent during tuning
Auto tuning heater 1 completed after 3 idle and 30 tuning cycles in 4475 seconds. This heater needs the following M307 command:
M307 H1 R1.621 C180.9:140.4 D7.18 S1.00 V24.1
Edit the M307 H1 command in config.g to match this. Omit the V parameter if the heater is not powered from VIN. -
How does the heater perform with those values?
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Still couldnt maintain temps with the cooler setup I have. so I'm changing my cooler to be less aggressive and will retune
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I can't tell from your pic, are you using a silicone sock?
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not presently, it was damaged and i havent replaced it
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A sock would be a big help if your fans are very powerful.
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I actually noticed it today myself, but when PID tuning my bed. It went on for 30 minutes before I stopped it. Just looped into heating up/down forever. Seems like something new in 3.2.2?
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@pkos Yes the PID algorithm in 3.2 has been updated to better handle larger slower heaters. It can take some time for it to run through it's cycles due to the time it takes to cool down. Best to just let it finish.
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I'll give it another try then, although 30 minutes got me worried