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Retracting while the head is parked seems to allow more ooze

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Overall Cura is fantastic, so TYVM Daid! Below is an idea I've had while watching prints.

Using PETG I've noticed ooze flow continues, even during and after retractions have occurred. Retractions do slow down the flow of material, so it's good to use them. But if the head stays parked while waiting for the retracting to happen then small blobs of material form beneath the nozzle. Later those blobs cause more issues when the head runs back over them.

If it's possible to have retractions occur while the head is moving to its next target, I think this could improve the printing process with certain ooze-prone materials.

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Simplify3D has an option called wipe while retracting that helps a lot to remove z scar and that static retract blobs.


Thanks for the tip on that feature. I have S3D and didn't realize it could do that. So of course today I went and experimented with that option. It opens a whole can of worms, and so far my results have not been better than the parked-head style of retraction.


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S3D default profile it's quite horrible to say the least. Even the starting gcode sucks (imo).

Ok got some time, so I made a basic (imo) S3D decent setup. You need to adjust speed and nozzle/bed temp. Fans are configured as I would do for something not critical, they should be tuned for each job.

Umo Plus and UM2 - Neotko basic profile

Note that the default (machine) starting sequence it's different on this profile, since I prefer to home the head, then the bed, then move down the bed 15mm, then extrude 9mm of filament to purgue, and then it goes to print.

And the ending gcode it will retract a total of 3mm.

This profile it's ready for 2,85mm users (I use 1.75) so probably the Coasting/wipe, should be higher on others.

Also this setup will retract A LOT (as it should). To disable many retractions, edit the profile and go to ADVANCED - and activate 'Only retract when crossing open spaces'. Also activate the 'Avoid crossing outline for travel movements' this second option it's like combing of cura, but on S3D you can specify how much, or less, you want your head to move around the print area.

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