power off pause / resume  

Re: power off pause / resume

I think you would need more than just firmware changes.

Re: power off pause / resume

Why?

There's already non-volatile memory on the board, to store the firmware. The printer just writes its last position & settings there, then resumes when you restart the print. Or it could even write it to the SD card.

edit: the microcontroller (ATmega2560 by the looks of it) has flash memory.

Re: power off pause / resume

Why?

Because when the bed cools, the part can become loose.

Peter

Re: power off pause / resume

Hmm, you can manually add an M25 Sxxxxx to one of your files. Change xxxxx to the number of seconds you want the print to pause for (3600 per hour) and then M24 to resume the print - see what happens. That will not shut down the power, but it will pause the print. Now you could add commands to bring the temperature down to where you would feel safe before pausing, but you run the risk Peter outlined where the print comes loose from the bed. You would also need to add commands to wait for the temperature to return to print settings before the resume code.

Personally, as long as there is a fire detection system in the room I am happy to run overnight and I also print during the day when no-one is home. I have suffered the occasional failed print, but I look at what Prusa is doing in their print farm and if they can run almost non-stop for weeks, I reckon the odds are on my side.

Re: power off pause / resume

Personally, as long as there is a fire detection system in the room I am happy to run overnight

I'm building a smoke/fire detection system onto the printer, but I think the sensor also detects the presence of alcohol. Houston ... 😆