PETG oozing on nozzle switch

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AirtomicEng
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Joined: Fri Oct 04, 2019 8:16 pm

PETG oozing on nozzle switch

Postby AirtomicEng » Tue Oct 15, 2019 7:10 pm

I'm trying to print a clear model using PETG as the main material and PLA/PVA as the support. (I'm testing with PLA and will swap to PVA once I have the settings down the way I want them.) Now I realize that PETG is notorious for oozing, but I've been able to print with PETG by itself without any problems. In fact, the only time it oozes is when it switches nozzles. I know its supposed to retract when it switches to prevent that, and I have the settings in the "Extruder Switch Ooze Control" box set to reflect that. The only thing I can think of is that it isn't retracting either at all, or at least, not as much as I have it set to.

I'm also noticing a different problem with my right nozzle. When it goes to create the first layer of the Ooze Tower, it puts out a HUGE blob of material that it never did before.

Here are the nozzle setups:
Left nozzle: PETG, 250C, 40mm/s retraction speed, 20 mm retraction on switch, 7.5mm retraction normal
Right nozzle: PLA 200C, 20mm/s retraction speed, 3.5 mm retraction on switch, 1.0 mm retraction normal

Any suggestions or idea on how I can stop the oozing?

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Vicky@Raise3D
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Re: PETG oozing on nozzle switch

Postby Vicky@Raise3D » Tue Oct 15, 2019 11:06 pm

Have you tried the cooling down feature in ideaMaker when the extruder is not printing?
You can set the temperature for PETG to be aroudn 220C when the other nozzle is printing. It may can help a little.

AirtomicEng
Posts: 10
Joined: Fri Oct 04, 2019 8:16 pm

Re: PETG oozing on nozzle switch

Postby AirtomicEng » Wed Oct 16, 2019 1:04 pm

Vicky@Raise3D wrote:Have you tried the cooling down feature in ideaMaker when the extruder is not printing?
You can set the temperature for PETG to be aroudn 220C when the other nozzle is printing. It may can help a little.


It oozes immediately after it switches nozzles. As near as I can figure out, its not retracting the material when the nozzle raises up for the switch, which forces more material into the hot nozzle. As I mentioned, I have the settings for PETG calibrated so it doesn't ooze when its the only material I'm using. It seems to me that the codes for retracting before switching aren't being used by the slicer, or are being ignored by the printer.

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Vicky@Raise3D
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Re: PETG oozing on nozzle switch

Postby Vicky@Raise3D » Thu Oct 17, 2019 7:06 pm

The moment nozzle switches, it is still under printing temperature which filament can melt. It will be reduced a lot once the temperature drops to lower.
I would recommend you to share your gcode files and images of your dual-extruder printing to http://help.raise3d.com to have our technicians to help review whether there's any code not working properly when slicing.

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Spud
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Re: PETG oozing on nozzle switch

Postby Spud » Thu Dec 05, 2019 11:36 pm

Viky- what is the proper retraction distance on tool change for PetG?
Also what speed of retraction?
I don't want to retract too much and get a jam.
I'm using Simplify3D and have been for 6 years.
California, USA
R3D Pro2

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Vicky@Raise3D
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Joined: Fri Mar 25, 2016 3:54 am

Re: PETG oozing on nozzle switch

Postby Vicky@Raise3D » Sat Dec 07, 2019 12:36 am

I would recommend to start from the default PETG settings and adjust the values a little each time based on the result.

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Spud
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Re: PETG oozing on nozzle switch

Postby Spud » Sat Dec 07, 2019 1:02 am

I don't know how to see those values in ideamaker.
I need those values to add into Simplify3D.

Can you tell me the values?
California, USA
R3D Pro2

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Vicky@Raise3D
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Re: PETG oozing on nozzle switch

Postby Vicky@Raise3D » Sat Dec 07, 2019 1:11 am

Here you go.
Screenshot_20191206171122.png

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Spud
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Re: PETG oozing on nozzle switch

Postby Spud » Sat Dec 07, 2019 4:06 pm

I would not have guessed 10mm retraction for PetG.
That looks like a clog/jam length.
I'll try it though.

Thank you.

jbc
California, USA
R3D Pro2

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Spud
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Re: PETG oozing on nozzle switch

Postby Spud » Sat Dec 07, 2019 4:53 pm

Vicky@Raise3D wrote:Here you go.
Screenshot_20191206171122.png


Is the PetG nozzle cooled down at all after retraction?
If so to what temp?

Where can I see these settings? Are they in my system somewhere?
California, USA
R3D Pro2

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Vicky@Raise3D
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Re: PETG oozing on nozzle switch

Postby Vicky@Raise3D » Tue Dec 10, 2019 2:23 am

You can set target temperature to ask the nozzle not going to print to cool down under Temperature tab. But it will only happen after nozzle switch but not retraction.
https://support.raise3d.com/ideaMaker/5 ... 5-442.html

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Spud
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Re: PETG oozing on nozzle switch

Postby Spud » Tue Dec 10, 2019 9:02 pm

Thank you.
jbc
California, USA
R3D Pro2


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