Add 4th extruder and option for single nozzle

[MagoKimbra]

Add code for 4th extruder.
Add option & code for singlenozzle.

[MagoKimbra]

do anyone interest this?

[MyMakibox]

Very interested. Can you explain exactly what the single nozzle
functionality is?
On 26 Jun, 2014 1:40 am, "MagoKimbra" [email protected] wrote:

do anyone interest this?

—
Reply to this email directly or view it on GitHub
https://github.com/ErikZalm/Marlin/pull/964#issuecomment-47134168.

[whosawhatsis]

@MyMakibox I believe that is the functionality for multiple extruder motors pushing filament into the same nozzle, for example using a bowden tube with a Y splitter so that you can extrude one filament, then back it up past the splitter and push the other one through to extrude it through the same nozzle.

[MyMakibox]

That's what I was hoping for. Perfect for small printers that can't support
multiple hotends.

My thinking was for gpio to control a relay, switching between stepper
motors. That way a single stepper driver can be used to control multiple
physical e-stepper motors. Many controller boards only have a single
e-stepper driver.

The process would be retract filament 1 to before the y-splitter, switch
relay to control stepper 2, extrude on stepper 2 so that filament goes
through the y-splitter and reaches the hotend, and finally dump a little
filament away from the print to get a clean transition.
On 26 Jun, 2014 9:55 am, "whosawhatsis" [email protected] wrote:

@MyMakibox https://github.com/MyMakibox I believe that is the
functionality for multiple extruder motors pushing filament into the same
nozzle, for example using a bowden tube with a Y splitter so that you can
extrude one filament, then back it up past the splitter and push the other
one through to extrude it through the same nozzle.

—
Reply to this email directly or view it on GitHub
https://github.com/ErikZalm/Marlin/pull/964#issuecomment-47180141.

[MagoKimbra]

Thx @whosawhatsis, You have explained perfectly.
@MyMakibox, I have already put the code for use with the ramps 1.4 4 engines that has 2 drivers, just using the relays that switch from one engine to another.
In marlin_main.ccp
//set rele for 4 extruder by MagoKimbra
#if defined(E0E2_CHOICE_PIN) && (E0E2_CHOICE_PIN >1) && defined(E1E3_CHOICE_PIN) && (E1E3_CHOICE_PIN > 1)
if (tmp_extruder == 0){
WRITE(E0E2_CHOICE_PIN,LOW);
WRITE(E1E3_CHOICE_PIN,LOW);
//active_extruder = 0;
}
else if (tmp_extruder == 1){
WRITE(E1E3_CHOICE_PIN,LOW);
WRITE(E0E2_CHOICE_PIN,LOW);
//active_extruder = 1;
}
else if (tmp_extruder == 2){
WRITE(E0E2_CHOICE_PIN,HIGH);
WRITE(E1E3_CHOICE_PIN,LOW);
//active_extruder = 2;
}
else if (tmp_extruder == 3){
WRITE(E1E3_CHOICE_PIN,HIGH);
WRITE(E0E2_CHOICE_PIN,LOW);
//active_extruder = 3;
}
delay(500);
#endif

The driver E0 control motor 1 and 3, the driver E1 control motor 2 and 4.

[boelle]

please rebase this on the latest v1 branch and submit a new pull request