Hello, I’m trying to update some taz 5’s in a school lab setting. The only dream feature I’d like to get working is stopping when the filament runs out. I’ve loaded up the firmware from the firmware tool, and it works, but I don’t know what to hook the other end of a switch to for the filament runout to be activated. The guide shows a signal port, but not a corresponding power or ground to hook the other side of a switch to.
Is it any +5v, -5v, +24V? can I hook it to a fan? chassis ground?
Will a regular switch even work?
The other end of the filament runout should connect to ground. Using one of the ground pins on the endstops is a good choice. Generally microswitches are used for this application, these generally have a common, a normally closed and a normally open. I am not certain which is required for the filament runout.
Well, shoot. looks like experimentation went wrong. I tried jumping to a ground, and got no response, tried a +5 off of the end stop pin and got nothing. Tapped the + on the fan 2 while the fan was on, to make sure it got power, and I think I fried the fan controller for the fan, because the fan and it’s LED turned off, and it’s beeping like I’m holding the select button on the lcd down, without holding the button down. I think I’m going to have to replace the rambo board.
Well, after replacing my other printer’s rambo with a new one that was DOA, I loaded the firmware up on my other TAz5.
Turned runout detection on, saved the setting, and hooked a test lead up.
While printing, hooking the lead from the indicated purple pin to a ground on an open endstop did nothing for a while. And then about 25 seconds later it ran the filament change routine!
I’m going to see what it does after sitting for an hour, without changing the filament.
@mbartell: There is a configurable amount of material that is extruded after a runout is detected. This is called the runout distance and is there so the filament in the feed tube is used. You can configure with https://marlinfw.org/docs/gcode/M412.html, or it may also be present in the LCD menu somewhere.
I found it in the menu. It’s the same screen as the load and unload adjustments.
Thank you! You have saved so many student projects!