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slic3r / Slic3r

Open Source toolpath generator for 3D printers
https://slic3r.org/
GNU Affero General Public License v3.0
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z lift - option to lift during travel, instead of before travel. #4973

Open paulnewall opened 4 years ago

paulnewall commented 4 years ago

Problem is: petg oozes, causing strings, and blobs at the end of travel moves when the ooze gets wiped off on the perimeter. Z lift can reduce the blobs by carrying them over the perimeter at the end of the travel, but z lift at the start of the travel makes strings worse by lifting slowly off the surface. Proposal: do the z lift at the same time as the travel (xyz move together) then the departure from the surface is fast, reducing strings. At the end of the travel z has lifted, reducing blobs. Unlift is still a vertical downward move. Implementation: I modified libslic3r in prusaslicer to implement this and it is working very well. It's not a trivial change because the existing code has the retract and lift code rather mixed together. I imagine making this an option would be safer than changing the existing behaviour of z lift in case some users want to keep the vertical z lift. Screen shot shows a horizontal view of the blue travel moves. Screenshot_2020-05-25_09-50-47

lordofhyphens commented 4 years ago

And of course it won't help firmware retraction.

lordofhyphens commented 4 years ago

Pull request with a test will go further :)