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google / OctoPrint-TemperatureFailsafe

OctoPrint plugin that will execute shell commands if a heater exceeds a failsafe threshold.
Apache License 2.0
26 stars 27 forks source link

Failsafes stops print during heatup #6

Closed fakio87 closed 6 years ago

fakio87 commented 6 years ago

Hi,

I have the problem, that failsafe will only work, when I preheat my printer manually.

As soon as I start a print without preheating the plugin will stop the print as the temo will be below the "low temp" parameter.

I could keep that parameter empty, however sometimes my printer is stopping heating when the print starts but keeps going which can lead to alot of stress for the extruder/nozzle if I am not present.

Is there any work around, that the failsafe will wait for the print to start until it is activated?

precision commented 6 years ago

The low temperature threshold is really meant to detect more of a thermistor failure / disconnected / wire break or short. It should be set to just below normal room temperature. I should probably be a little more clear in the README what that option is for. Can you try setting it to something just below room temp and see if you still have a problem with it spuriously firing?

fakio87 commented 6 years ago

Hi, thank you for the fast reply!

Sure, I understand the meaning and how to avoid that issue. Thank you for explaining.

Practically this will not help me with the reason I put the threshold that high. But it is okay,

I will just preheat manually.

Uriah Welcome notifications@github.com schrieb am Sa. 11. Nov. 2017 um 17:03:

The low temperature threshold is really meant to detect more of a thermistor failure / disconnected / wire break or short. It should be set to just below normal room temperature. I should probably be a little more clear in the README what that option is for. Can you try setting it to something just below room temp and see if you still have a problem with it spuriously firing?

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/google/OctoPrint-TemperatureFailsafe/issues/6#issuecomment-343674925, or mute the thread https://github.com/notifications/unsubscribe-auth/Af1cEzPCFu9dbHKGdzR478GH7NUIYGsyks5s1cU9gaJpZM4Qaeuu .

precision commented 6 years ago

Can you explain to me your use case? I don't mind adding a little more logic to the lowside failsafe, I just want to understand what you're trying to accomplish by having it set higher.

fakio87 commented 6 years ago

Hi,

from time to time the following scenario is happening:

I start a print. Heatbed is heating up Hotend is heating up Printer is homing all axis heaters are switched off (Don't know why, happens or doesn't happen with the same gcode) Printer starts printing E-Stepper feeds filament into the nozzle that is cooling down

In case that happens I want the printer to notice and stop the print job.

Uriah Welcome notifications@github.com schrieb am Sa. 11. Nov. 2017 um 20:57:

Can you explain to me your use case? I don't mind adding a little more logic to the lowside failsafe, I just want to understand what you're trying to accomplish by having it set higher.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/google/OctoPrint-TemperatureFailsafe/issues/6#issuecomment-343690128, or mute the thread https://github.com/notifications/unsubscribe-auth/Af1cE1pnRxhkyTf-bOUtyZKw5YibAVyuks5s1fwfgaJpZM4Qaeuu .

jeffmaeder commented 6 years ago

At first when adding this plugin I thought it would only protect the case where the temp runs out of control high. To my surprise it actually had protection for low temp set points as well. The failure mode I was experiencing was similar to fakio87, after I started a print at some point the heated bed would stop heating. As a result the print would shrink and detach from the bed and well.....everyone has seen it! It turns out some of the solder joints on the mosfet I was using for the heated bed had become compromised . If this Plugin would start examining the temperatures after the "M117 Printing..." line in the starting gcode it would protect against the temp drifting low during a print. This way you wouldn't have to manually preheat the printer.

precision commented 6 years ago

It sounds like you want the equivalent of Marlins thermal protection then? I don't think that'd be all that difficult to add to the plugin. I'll see if I can add something later this week.

jeffmaeder commented 6 years ago

Yes that sounds exactly like what i'm describing. Thank you very much for looking into it.

fakio87 commented 6 years ago

If you could add the option to start the Failsafe from M117 despite from heatup that'b great.

Somehow since my last update I cannot install failsafe anyway. I guess all plugins need to be updated to show up in the latest version of octoprint?

precision commented 6 years ago

@fakio87 I'd be happy to review a patch, however having the plugin only start once a print has been activated is counter to what I use/want this plugin. I use/intended this plugin for a backup failsafe in case my AC SSRs were to fail closed, which theoretically could happen at any time.