Page 1 of 1
What is M302 undo command?
Posted: Thu Jun 26, 2014 9:38 pm
by Lateralg
M302 allows cold extrusion.
After sending M302, how do I return to normal?
Re: What is M302 undo command?
Posted: Thu Jun 26, 2014 10:24 pm
by Dale Reed
Lateralg,
Couldn't find one on RepRap wiki or Marlin sites. I did find a firmware called "5DPrint" that uses M302 P1 to allow cold extrudes, and M302 P0 to disallow cold extrudes. I suppose you could try those commands and see what happens.... Maybe Marlin will incorporate (someday)?
Otherwise, I suppose you'll have to initiate a machine reboot or cycle power...
Dale
Re: What is M302 undo command?
Posted: Thu Jun 26, 2014 11:59 pm
by Tim
The actual Marlin code for M302 is:
Code: Select all
case 302: // allow cold extrudes, or set the minimum extrude temperature
{
float temp = .0;
if (code_seen('S')) temp=code_value();
set_extrude_min_temp(temp);
}
break;
So if you do just "M302", this is equivalent to "M302 S0", or allow extruding at any temperature above 0C.
If you want to return to normal, do for example "M302 S150", with S set to something slightly below your set temperature.
Re: What is M302 undo command?
Posted: Fri Jun 27, 2014 2:06 am
by Dale Reed
The source code!!! OF COURSE!!! I'll have to save a copy on my work PC so I can offer USEFUL responses when I sneak a look at the forum when I'm supposed to be working....
Thanks, Tim!
Dale
Re: What is M302 undo command?
Posted: Fri Jun 27, 2014 2:25 am
by sprior
Use The Source Luke!