Porus and pointed seems
I'm having trouble with the seem on a single wall PLA extrusion. I'm trying to make clay tools for my wife and I can't get the seam under control. I'm using a .4mm nozzle and tried different layer heights from .7 to .2mm. With my extrusion multiplier perfectly dialed in get a porus seam. With the extrusion multiplier cranked way over and the retraction turned off. I get a solid sesm though with a seam spine pointed into the work piece. It is like the extruder is whipping into the tool. Is there a way to get it to point out?
RE: Porus and pointed seems
To clarify I am using Atomic filament. With the presets they were close but I ran numerous beachies to get it printing precisely. When I mention dialed in, I used the 40-40-40 calibration cube for the Extrusion multiplier as well as the visual cube to get the top layers smooth, shiny, and without scarring or filament buildup near the perimeters.
RE: Porus and pointed seems
Theres various things you can try. If you attach a prusa slicer project file (file>save project as) and then zip up and attach the .3mf saved we can look at your settings and maybe target/suggest them better.
But general things to try-
turn off retract on layer change (Printer Settings>Extruder)
also turn off wipe while retracting
If those don't help you could try a small value in the extra length on restart, something small to start like 0.1-0.2.
are you using arachne or classic perimeter generator btw ?
RE: Porus and pointed seems
Thanks so much for the response. I Just made another in a translucent green, it shows the wipe a bit clearer on the inside. This time on the top section I set the seam to random with the retract on layer change and wipe while retracting off. Additionally the retract length is set to.1mm.
But even with the retract length set to 0 to disable I get this little pimple or ridge wiped to the inside.
3mf zip file
RE: Porus and pointed seems
Those might just be the unavoidable seam. In your project file, the seam alignment is set to "random" which typically produces this effect. Try setting it to "aligned" - this will still give you a seam (no way around that with an FDM printer), but it will look less random and faulty.
There's also a way to tell the slicer where exactly to put the seam (something with "paint seam", never used that) - it would probably be the least annoying when placed directly in the sharp tip of the model.
RE:
I get that there will be seams. My problem is the seam is forming a ridge toward the inside of the cutting edge. This ridge is affecting the clay cut out my wife is trying to make for her artwork. I think this seam is forming because in the slicer or machine even with the wipe turned off it keeps wiping in on the Z-lift. If I could get it to stop wiping or even wipe out I'd be golden!!!
These samples in Prusament Galaxy black really show the seam built up to the interior. You can see a prominent ridge pushed to the inside and a negative dive on the outside.
RE: Porus and pointed seems
RE: Porus and pointed seems
Have you played with the seam settings in PrusaSlicer (under [Print Settings])? Also have you tried the Seam Painting Tool to position it somewhere better for you?
RE: Porus and pointed seems
I have but unfortunately the seam or ridge formed from the move up to the next layer will catch the clay and lift it up distorting it.
Even with the retraction set to zero disabling it or wipe unchecked I still get this interior wipe forming a ridge or seam into the finished piece. It doesn't appear that I am actually able to turn off the interior wipe in the slicer. Because if it actually wasn't conducting a nozzle wipe, why would the exterior form a feature below the exterior surface and a pronounced ridge formed on the inside ?
RE: Porus and pointed seems
Could you try this please,
I don't have a Mk4
It should at least give you no seam in the thin section of the cutter!
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Porus and pointed seems
Not a short term fix, but a feature request for PrusaSlicer that I recently made maybe something that you would be interested in: A method for less visible seams
RE: Porus and pointed seems
Cool thanks so much. I'll have to give it a try!!!
RE: Porus and pointed seems
Wow very cool that looks pretty amazing. and promising I deffinetly want to give it a try. You used it with variable layer height in a sample pic. Would it also work with just 0.1mm or 0.07mm layers heights?
Not a short term fix, but a feature request for PrusaSlicer that I recently made maybe something that you would be interested in: A method for less visible seams
RE: Porus and pointed seems
The nominal layer height that I used was 0.2mm. With the full circle scarf the effective layer height at the side opposite the start of the seam the layer height is half of the nominal, and so 0.1 for the example. The 'variable' layer height is only within the scarf seam region, so for the 80° examples it extends over less than a quarter of a turn. (For non-circular objects the scarf seam should be measured in distance rather than degrees.)
Yes, I don't see any reason to suppose that the scarf seam requires any particular nominal layer height. Well, as long as the extruder works well enough for very low extrusions.