Open XCTracer opened 1 year ago
DVSVIDEO
commented
1 year ago Have you tried adding an extra length of retraction to this foaming material profile? If you pull the material out of the hot zone no more gas develops to foam and push the material out...the usual retraction is not enough here. I haven't tried it myself, it's just a logical question...
XCTracer
commented
1 year ago Yes, of course. This does not solve the issue. There are limits how far you can retract when you have an all metal hot end. I tried many things, but nothing works. The only thing that will work is to have a time dependent extra length on restart.
Von: DVSVIDEO @.> Gesendet: Donnerstag, 13. April 2023 00:55 An: prusa3d/PrusaSlicer @.> Cc: XC Tracer @.>; Author @.> Betreff: Re: [prusa3d/PrusaSlicer] Oozing Of Foaming Filament / De-Retraction / Extra Length On Restart / Time Dependent (Issue #10311)
Have you tried adding an extra length of retraction to this foaming material profile? If you pull the material out of the hot zone no more gas develops to foam and push the material out...the usual retraction is not enough here. I haven't tried it myself, it's just a logical question...
— Reply to this email directly, view it on GitHubhttps://github.com/prusa3d/PrusaSlicer/issues/10311#issuecomment-1506069382, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AXXER2GFQNO6WVFTG7SMWYDXA4XD3ANCNFSM6AAAAAAWY4DXBY. You are receiving this because you authored the thread.Message ID: @.**@.>>
HB-Stratos
commented
3 months ago Just chiming in to also say I would like to see this implemented. It would be super useful for LW-PLA as it is entirely impossible to stop it from oozing due to its foaming nature. I believe the best implementation would be to measure the time between retraction and restart. I don't think going by travel distance has much merit as the oozing out of the nozzle is not (or only barely) affected by travel speed, but strongly affected by the time spent not extruding. I am also thinking of a Klipper Macro implementation of this feature, but I'm not sure if this is even possible yet, and if it was, it would be quite hacky. A slicer implementation would be best.
HB-Stratos
commented
3 months ago Hey @XCTracer if you're still reading this. I have gone ahead and wrote a python gcode postprocessor that is capable of adding extra restart distance based on estimated travel time. It is very rough around the edges at the moment, but I could use help tuning it if you're interested. I've thrown the script on gist before I make it a proper repo, find it here: https://gist.github.com/HB-Stratos/288777eaa019f8488e4804fa30b764e7
XCTracer
commented
3 months ago I already did the same with a Python script. This works quite well, only little sand paper work is necessary afterwards. Send me an email at @.*** for more information.
From: HB-Stratos @.> Sent: Tuesday, July 2, 2024 2:38 AM To: prusa3d/PrusaSlicer @.> Cc: XC Tracer @.>; Mention @.> Subject: Re: [prusa3d/PrusaSlicer] Oozing Of Foaming Filament / De-Retraction / Extra Length On Restart / Time Dependent (Issue #10311)
Hey @XCTracerhttps://github.com/XCTracer if you're still reading this. I have gone ahead and wrote a python gcode postprocessor that is capable of adding extra restart distance based on estimated travel time. It is very rough around the edges at the moment, but I could use help tuning it if you're interested. I've thrown the script on gist before I make it a proper repo, find it here: https://gist.github.com/HB-Stratos/288777eaa019f8488e4804fa30b764e7
— Reply to this email directly, view it on GitHubhttps://github.com/prusa3d/PrusaSlicer/issues/10311#issuecomment-2201551194, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AXXER2BWWJ5ADMJQ7YRBBPTZKHZCBAVCNFSM6AAAAABJPPL2YOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDEMBRGU2TCMJZGQ. You are receiving this because you were mentioned.Message ID: @.***>
HB-Stratos
commented
3 months ago It looks like github automatically censored out your email
When using foaming filament then the nozzle ooses filament when the extruder is not feeding any filament. The longer the extruder is idle the more foaming filament oozes out of the nozzle.
The problem is now that when the extruder starts to extrude again that there is then not enough foaming filament inside the nozzle. So after a longer travel with an idle extruder the nozzle has lost a considerable amount of filament. Now when printing again then there is not enough filament coming out of the nozzle, and this leads to issues up to holes in the printed part. You can clearly see this in the provided pictures.
"extra lenght on restart" does not solve the issue. It may be too much or too little, depending on many milliseconds the extruder was not extruding.
Best would be to have an option for foaming filaments to define an "extra lenght on restart", depending on the time that the extruder has previously been on idle. A small look up table, user definable, would be good enough to solve the issue. The user can define a few lines, each line has an entry for how long the extruder was idle, and how much "extra lenght on restart" to add:
0ms / 0mm 200ms / 0.2mm 500ms / 0.4mm 1000ms / 0.7mm 2000ms / 1.2mm
It would be very easy to implement in the code: Start a timer when the extruder goes from extruding to idle, then calculate the dt when the extruder starts extruding again, and then use the small look up table to calculate the extra length on restart. With this simple function a lot of issues due to oozing (foaming) filament can get solved.
What would also be great is an option in PrusaSlicer to display how long the extruder is idle when the print head is moving without extruding. Like this the user can then check where the issue is, see how long the travel takes, and then modify the settings in the look up table accordingly.
I have tried many different solutions, but nothing works. The longer the extruder is idle the more foaming filaments leaks out of the nozzle. Retraction does not help to fix the issue. Especially with an all metal hot end the retraction is limited.
With "avoid crossing perimeters" the noozle ooses on the print itself, so that's not an issue. Just the missing filament when the extruder starts to extrude cannot get solved. All the tests have been made using PrusaSlicer 2.6.0-Alpha6.