Vase mode glitching Grrrr suggestions?

[nerys]

I do some complex vase mode printing. complex multi surface models with cuts in key places to permit vase mode printing.

Sometimes I get glitches with particularly complex models usually at transitions from one shape to another where the algo does not like the end point of one shape being the same as the start point on the new shape so it will "jump" or it will leave a gap in the layer etc..

usually pretty easy to fix.

This model however just won't slice right. whats really odd is its an out of the blue glitch. usually as noted above the glitches are at transitions but this glitch is "mid shape" where it should be the cleanest IE no reason at all to glitch at all. Usually the only time I see this kind of glitch is with a model defect that s3d can't "clean" but I have done everything I can and I can't figure out what might be wrong with the model. even the slice preview does not show a defect (anytime there is a model defect there is usually an obvious pathing issue in the slicer preview that lets me pinpoint the issue. but this one appears clean its in MOD PATH and just "jumps" for no apparent to me reason.

Suggestions? I have tried repair model I have tried rotating (but that adds its own issues at transitions) I can't seem to get the glitch to go away. this glitch is in both v4 and v5 though its slightly worse in v5

[S3D-Jason]

Can you tell us what specific layer is having the problem? Maybe post a screenshot pointing to the issue in the preview?

[nerys]

those retractions/movements should not exist and I see no defect in those spots to cause those actions

this should be a constant spiralize movement.

[S3D-Jason]

I think vase mode only works if you have a single outline. This has multiple outlines with holes, pockets, etc. If you print something with multiple outlines I think you have to stop extruding when you move from one outline to another, so that creates a retraction.

[gearsawe]

I see what you are doing I have done the same on lesser complex model. Think S3D is not working with enough decimals or it is trying to heal things it thinks are very small gaps. These micro notches are very tiny.

This does not solve the problem but points to some issues. I set the nozzle width down to 0.30 and It seems to path better and not do a bunch of retractions. Maybe make these notches bigger as a test ? What was this designed in? it is doing something very odd at the end of these notches.

[nerys]

I think vase mode only works if you have a single outline. This has multiple outlines with holes, pockets, etc. If you print something with multiple outlines I think you have to stop extruding when you move from one outline to another, so that creates a retraction.

Negative. this model is spiralize/vase compliant.

The multiple outlines are connected with cut throughs and the pockets are formed by compliant cut in's

S3D paths using the outside perimeter of the model so the extrusion is "in" from that. so the cut in's and cut through's are 0.01mm thick and the partial cuts (making the pockets) are 0.8mm distance from the outer wall so that the slicing engine path both the outside perimeter and the "pocket" without collissions ie a valid sliceable vase perimeter. trust me. it works. its kind of my speciality.

the slicing engine is either glitching or a portion of the model is causing is to glitch but I can't tell what. just "ROTATING" the model changes everything (which indicates its a slicing engine issue as if it was a model defect the defect would not "move" when you rotate the model. it would stay in the same model relative location.

its strange that its doing it what would previously have been a "clean" area of the model. I usually only see this issue at transitions from one shape to another (such as from the large cone to the cap portion)

While I don't know for certain I suspect S3D calculates the perimeter rise of each "quazi layer" from the beginning of the model so a "hard transition" needs to have its "start point" near the projected end point of the last segment or S3D gets "confused" and creates a "hard jump" to get from its projected end point to its "desired" start point of the new part after transition. so I simply rotate the one part to put what I think it wants as the start point to be near the point it wants as an end point (ie I look at the retraction/move shift and I align them) I rotate the next component to align those two points and that usually fixes the problem.

THIS issue is happening "mid part" though not in a transition.

LOOK at the slice. (factory file was attached) you can see there is no break but the slicer breaks anyway for some reason.

[nerys]

I see what you are doing I have done the same on lesser complex model. Think S3D is not working with enough decimals or it is trying to heal things it thinks are very small gaps. These micro notches are very tiny.

This does not solve the problem but points to some issues. I set the nozzle width down to 0.30 and It seems to path better and not do a bunch of retractions. Maybe make these notches bigger as a test ? What was this designed in? it is doing something very odd at the end of these notches.
Width040and 030.png
MicroNotch.png

yes. when it does that "angle" thing that is a glitch in the engine. it should not be doing that.

and yes sometimes changing nozzle size can alleviate some issues (also changing layer height can sometimes "fix" the issue)

IE those are work arounds (as you noted) to an issue in the engine. its trying to adjust for something that just is not their. also check your thin wall behaviour that can also have it doing weird things on models like this.

[S3D-Jason]

Those notches just look like the retraction dots in the preview to me. If you disable the checkbox for "Show retractions", do they go away?