Fire safety/thermal runaway detection?  

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.

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?

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 ?

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

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 🙂

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 😆