Extruder motor is not alive [solved]
Hello everyone,
I've just finish the assembly of my i3 mk2, I've got an issue with the extruder motor. (And many more problems, but let's do one by one)
When I do the sefltest, or when I use the "move the axis" of the menu, the X/Y and Z motors are moving, no problem.
But the extruder motor does not.
I checked again and again connection, wire, all is OK, but impossible to move the extruder motor.
So to know if it's a motor problem, I connected the extruder motor on the X-axis (from the rambo), then move the X-axis in the menu. And it works well, so the extruder motor is good!
What could be the problem? Is it the rambo card? (connector seem to be in good shape) or the firmware (I'm in 3.09) ?
Re: Extruder motor is not alive
💡 the extruder motor only moves when the hotend thermistor reports a temperature that's able to melt the filament (must be higher than 130°C).
so it's not a bug, it's a feature.
dem inscheniör is' nix zu schwör...
Re: Extruder motor is not alive
OK, thank you very much for that quick reply.
I thought we could move all the axis without any reports like temperature or endstops with the menu "move the axis".
Thanks!
Re: Extruder motor is not alive
it's a safety mechanism. otherwise you could accidentially damage the extruder pulleye while grinding cold filament between stepper and 625 bearing.
dem inscheniör is' nix zu schwör...
Re: Extruder motor is not alive
Thank you for the explanation JeffJordan.
But where could I have find this information? I search before asking on the forum, but I didn't see it anywhere in the different manual.
Re: Extruder motor is not alive [solved]
💡 it's a basic feature of all the marlin based firmwares, from where the prusa i3 mk2 is some kind of "child". usually it is set to 170°C, but at our prusa it's only 130°.
➡ i just discovered it recently, because i've a project running to build a 2nd printer out of the spare parts that i've got in the meantime.
and there i stumbled over the following in the configuration_prusa.h (line 86*):// Extrude mintemp
#define EXTRUDE_MINTEMP 130
and inside the configuration.h (line 164*) a: #define PREVENT_DANGEROUS_EXTRUDE.
*lines refer to the 3.0.10-alpha firmware
by the way (just for test purposes): you can fool the printer to think his hotend is about 177° hot, if you temporarily replace the hotend thermistor by 2 jumper wires and a 1k ohm resistor.
dem inscheniör is' nix zu schwör...