NoisyBoy1308
Posts: 12
Joined: Tue Jul 25, 2017 11:51 am

Retract all extruders at once

Sat Dec 16, 2017 2:22 am

Hello,
I have a diamond Hotend and i am not able to stop it from oozing.
So i contacted reprap. me Support.
The told me to Perform every retract on All 3 extruders at once.
Can someone give me a hint, how i can do that?
My idea was to create a 4th Tool. A virtual one, wich mixes all 3 colors with the same rate. If g-code Performs a retract, this extruder will be activated to retract.

I have no idea, how to Do this.
Is this a good idea anyway?
Thanks,
Philipp

brian442
Posts: 1243
Joined: Mon Nov 28, 2016 5:35 am

Re: Retract all extruders at once

Sat Dec 16, 2017 5:38 am

How did the reprap.me people recommend that you do it?

NoisyBoy1308
Posts: 12
Joined: Tue Jul 25, 2017 11:51 am

Re: Retract all extruders at once

Sat Dec 16, 2017 6:24 am

They did answer my request in a very short manner :
"You need to setup software retraction where it will retract on all extruders at once"

NoisyBoy1308
Posts: 12
Joined: Tue Jul 25, 2017 11:51 am

Re: Retract all extruders at once

Mon Dec 18, 2017 7:17 am

how can i Setup this?

horst.w
Posts: 833
Joined: Fri Oct 17, 2014 5:00 pm

Re: Retract all extruders at once

Mon Dec 18, 2017 3:13 pm

I'm sorry, but I don't understand the problem!

You have an active extruder that works, the inactive tools are retracted (???).
To change the tool for the next color the active tool retracts and the new tool restarts.

What is the situation, when you want to retract all tools together in one step?

The G-code changes from one tool to the next tool by only calling the toll-number without any G- or M-code:

e.g.
G28 ; Home all axes
G1 X20 F3000 ; Bring extruder to the front
T0 ; Switch to left extruder
G92 E0 ; Zero the extruder
G1 Z0.3 ; Lower buildplate
G1 X125 E30 F225 ; Purge left nozzle
;G1 X45 Y25 F2100 ; Wipe nozzle
G92 E0
G1 E-5.9000 F1500


The bolded lines are
- change to tool ... what is now the active tool
- retract the active tool

I have only the idea to call the tools T0 T1 T2 and the E-command in one line (F not needed)
T0 T1 T2 E-5.0 F1500

Hope it works.

Regards
horst.w
GER


NoisyBoy1308
Posts: 12
Joined: Tue Jul 25, 2017 11:51 am

Re: Retract all extruders at once

Tue Dec 19, 2017 10:34 am

horst.w wrote:I'm sorry, but I don't understand the problem!

GER
The Problem is, that since this is a 3in 1 out nozzle, the inactive Extruders still produce pressure when retracting the active one. This results in heavy stringing.I do not know, if you can call all Tools in one line, but I will try. Right now , the Printer is buisy with another piece, that will end up as trash :lol:

The Problem is not the switching the Colors. I try to print single Color at the Moment. The stringing will occur always, I think , because of the pressure provided by the inactive Extruders.

horst.w
Posts: 833
Joined: Fri Oct 17, 2014 5:00 pm

Re: Retract all extruders at once

Tue Dec 19, 2017 2:03 pm

...ok, now ...!

Do you know this ? http://reprap.org/wiki/Diamond_Hotend ; Assembling , point 5 to ...

H.

NoisyBoy1308
Posts: 12
Joined: Tue Jul 25, 2017 11:51 am

Re: Retract all extruders at once

Wed Dec 20, 2017 10:53 am

thanks for that link. the Extruders are set up exactly like that. but only the active one retracts

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