Scarf ignores avoid crossing walls

[Rzv_Simi]

Hello there

Not new to 3d printing, new to bambu lab, first time posting here, maybe some of you smart people have an idea about this topic.

Recently, I’ve fallen down the rabbit hole trying to get rid of seam blobs, what else is new?

Case in point, designing a hygrometer gasket (bl 95a hf tpu) for a drybox, I’ve managed to get a pretty good result, not the best, but way better than the default auto profile.

BUT, it involves no retraction for longer travel than the scarf length, and the inside of the circle looks like this

because the travel from the end of the scarf of the inner wall and the beginning of the outer line crosses the wall although the avoid crossing wall option is checked with 1000mm set as length

My question for the more experienced in bl studio is this a feature or a bug? shouldn’t all moves avoid crossing walls, not just those that feature retraction?
because if I set a shorter length than the scarf length to trigger a retraction, avoiding walls comes into play as expected

is there another option I’ve overlooked?

Cheers
Razvan

[Olias]

I’ve never found a definitive answer to this but based on experience with using “Avoid Crossing” walls, I suspect the operative word here is “Avoid” as opposed to “Block” or “Prevent”. I’ve seen too many occasions–particularly with TPU–that the slicer simply ignores the setting. I say particularly with TPU not that TPU is treated differently it’s just that when the nozzle does cross the path, with TPU it becomes much more obvious as that filament just loves to string.

The only thing I might suggest is where you set the max detour length. You have it set to 1000. I suspect that the slicer treats that as 1000%. Instead try explicitly stated 1000mm and see if it changes the results.

[Rzv_Simi]

Hello, thank you for the reply. I’ll give it a try, who knows, maybe it’s some kind of quantum entanglement at play here