1 Topic by widespreaddeadhead

  • widespreaddeadhead
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Topic: Ooze prevention on dual extruders

Question for anyone who has used silc3rs ooze prevention option for dual extruders.

Is the skirt it wipes onto after each layer the same skirt that I can modify in the skirt/brim settings?

Wondering because after several layers of a dual color print on our Workbench, with a skirt 7mm away from the object, it parked one of the extruders over the print while the other was parked on the skirt, which leaked plastic all over the print.

Another thing arose when it was parked in the situation above, the print fan, air, at 49, was cooling the nozzles enough that they couldn't get back up to temp. Is there a option/gcode to turn the print fan off when it is heat/cooling the extruders and back on when it starts printing again?

FuseBox 1.5 CoreXY - e3dv6 - Graphic Smart Display
Solidoodle 2 - e3dv6 - Hobb Goblin - e3d Titan - lawsy carriages - Direct Drive Y Axis - T8 Z axis - OctoPi

2 Reply by carl_m1968 (edited by carl_m1968 2015-09-25 19:24:09)

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Re: Ooze prevention on dual extruders

If you have dripping then the issue is your temp is too high and possibly retraction is set wrong. Your heat is set to soften the filament so it is pliable and sticky but not dripping or liquified. My CTC does dual and has never dripped. It actually retracts the filament a bit on the idle head so there is no pressure. With the temp set propely and no pressure you should not drip.

Printing since 2009 and still love it!
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3 Reply by jagowilson

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Re: Ooze prevention on dual extruders

In Slic3r printing a skirt of height 999 will allow any hanging filament to get knocked off the nozzle and away from the print. I've seen many people do this successfully. Try moving  the skirt far away enough that the print can't be touched by either nozzle when working on the skirt.

You might also try the "avoid crossing perimeters" setting, which will reduce the impact of leaked filament.

As for the fan, there is no such option in Slic3r, but the assumption of a cooling fan is that it will NOT disrupt hotend temperature. So, you're going to need to adjust that fan until it can't impact the temperature of the nozzle, or insulate the nozzle better. If you just want it off at the start of a print, put M107 in your start GCode.

4 Reply by widespreaddeadhead

  • widespreaddeadhead
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Re: Ooze prevention on dual extruders

Thanks for all the advice! First thing this morning was a ooze temp test. Now running a print with new settings, and since I have no overhangs or bridges so I just turned the print fan off.

FuseBox 1.5 CoreXY - e3dv6 - Graphic Smart Display
Solidoodle 2 - e3dv6 - Hobb Goblin - e3d Titan - lawsy carriages - Direct Drive Y Axis - T8 Z axis - OctoPi

5 Reply by widespreaddeadhead

  • widespreaddeadhead
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Re: Ooze prevention on dual extruders

Turned out well. Still need to calibrate my temps to prevent oozing. I used 10C as my ooze prevention, but with the print fan turned off I can up that a bit to help. The skirt trick worked out very well for me. I need to try some different retraction settings, but overall I feel it turned out very well. Thanks for pointing me in the right direction.

http://soliforum.com/i/?2kOdSI7.jpg
Picture of the print with the skirt before I cleaned up the print.

http://soliforum.com/i/?90qUG0r.jpg
Picture of the print with one I printed from an earlier thread, some of you might remember this one.

FuseBox 1.5 CoreXY - e3dv6 - Graphic Smart Display
Solidoodle 2 - e3dv6 - Hobb Goblin - e3d Titan - lawsy carriages - Direct Drive Y Axis - T8 Z axis - OctoPi

6 Reply by jagowilson (edited by jagowilson 2015-09-30 01:00:12)

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Re: Ooze prevention on dual extruders

Looking good after cleanup! smile

If you're up for it, a Chimera will likely ooze a lot less than the stock hotends. Those PEEK hotends store a lot more molten filament than any all-metal hotend. Something to think about later on, if one of the hotends failed or something.