Fire safety/thermal runaway detection?
 
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Matt
 Matt
(@matt-21)
Eminent Member
Fire safety/thermal runaway detection?

I'm very new to the 3d printing world, but I immediately sense risk with these long print times and the nature of hobbyist electronics (no offense to Josef, stuff happens!) I am wondering if the mk2 has any sort of thermal runaway detection or built in failsafe to reduce the chance of a fire?

Opublikowany : 12/06/2016 9:41 pm
Josef Průša
(@josef-prusa)
Member Admin
Re: Fire safety/thermal runaway detection?

Yes, thermal runaway is implemented. If temperature drops while heater is heating and will not recover in couple seconds, printer will shut down.

Founder and owner / Majitel a zakladatel
Opublikowany : 12/06/2016 9:44 pm
Matt
 Matt
(@matt-21)
Eminent Member
Topic starter answered:
Re: Fire safety/thermal runaway detection?

Thanks for the quick reply Josef. Do you feel it's safe to leave the mk2 printing unattended for any amount of time, assuming it was assembled correctly?

Opublikowany : 12/06/2016 9:49 pm
Nicolas
(@nicolas-6)
Eminent Member
Re: Fire safety/thermal runaway detection?

Hi Josef,

I was going to ask the same question.
I looked into the github and find that THERMAL_RUNAWAY_PROTECTION_PERIOD and THERMAL_RUNAWAY_PROTECTION_HYSTERESIS so I was thinking about compiling it with this option.
But now I see it's already enabled, great.

For my own culture, can you tell me why I wasn't able to see it on the github ?

Edit :
By the way, the github doesn't seem to be up-to-date, last firmeware on github is 3.0.1 vs 3.0.3 on website.
Is there another place where the code is up-to-date ?

Opublikowany : 12/06/2016 9:58 pm
Jonathan
(@jonathan-13)
New Member
Re: Fire safety/thermal runaway detection?

I haven't got my printer yet but have been kinda lurking and looking at the code until it comes in. Unlike most other printers much of the configuration is in the variants folder and the configuration.h file #includes that at the beginning. So there are some things that look like it is commented out in the main configuration.h file but are included in the variant's config file. There is a popular knockoff i3 with no safety what so ever. A good reason for going with the OG prusa. For the MK2 you you find in the variants folder:

#define TEMP_RUNAWAY_EXTRUDER_HYSTERESIS 15
#define TEMP_RUNAWAY_EXTRUDER_TIMEOUT 45

// Maxtemps
#define HEATER_0_MAXTEMP 305
#define HEATER_1_MAXTEMP 305
#define HEATER_2_MAXTEMP 305
#define BED_MAXTEMP 150

// Mintemps
#define HEATER_0_MINTEMP 15
#define HEATER_1_MINTEMP 5
#define HEATER_2_MINTEMP 5
#define BED_MINTEMP 15

Opublikowany : 13/06/2016 12:00 am
erron.w
(@erron-w)
Estimable Member
Re: Fire safety/thermal runaway detection?

Thanks for the quick reply Josef. Do you feel it's safe to leave the mk2 printing unattended for any amount of time, assuming it was assembled correctly?

I leave all 3 of my Mk 1's running unattended every day when im at work. And ive done several 24+ hour prints, This is one of the very best reasons to always us high quality components for 3d printers, which Josef has selected 🙂

Opublikowany : 13/06/2016 12:56 am
Nicolas
(@nicolas-6)
Eminent Member
Re: Fire safety/thermal runaway detection?

...

Thx for pointing me in the right direction.
I was thinking about something like that, but the github's search engine doesn't seems to be very good 😆

Opublikowany : 13/06/2016 10:25 am
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