@dc42
David
could you give me an example. We can use the expansion header above E6.

I need a trigger signal every time extruder T1 becomes engaged.
Just to be clear I have 2 extruders, T0 and T1.

I have to push down T1 with a solenoid every time it needs to be used.thanks

I'm looking to engage a air solenoid when extruder T0 finishes and extruder T1 starts to print. I have to push down T1 well it's printing, and springs bring it back up.

Here is what I'm trying but nothing seems to happen. The solenoid actually works though during startup, when I power up the machine.

M106 P0 I-1
M571 P"FAN0" S1

I'm using 2 extruders and I need to lift my second extruder when it's not printing. So I'm trying to use.
M571
How do I address the second extruder using this command

@dc42
I'm using 2 extruders and I need to lift my second extruder when it's not printing. So I'm trying to use.
M571
How do I address the second extruder using this command

is this correct
M106 P20 I-1
M571 P20 F200 S255

I'm trying to configure M571 to turn on Fan 0 everytime the extruder is started.
I've tried this but I think I'm missing something

M571 P0 F200 S255

I'm trying to trip a 5-volt small solenoid every time the extruder comes on.
Danny