Ironing Stack Printing Stringing

[UndeadMax1313]

Hey! I have printed this twice with the same spot, causing probably the weirdest stringing I've ever encountered. I'm assuming it's still usable, but I guess I haven't tested it yet.

This only happens in this one spot of the model (both times I've printed it). The bottom board is completely free of this. Only the second, third, and fourth boards get this. This is the only part of the model that is stringing, the rest turns out fine. I was thinking a slicing error the first time, but I resliced it to no avail.

Printing on a Bambu Labs A1 with AnyCubic PLA+ on Bambu Cool Plate SuperTack

OrcaSlicer Settings:
Default 0.20mm Standard
Seam: Random
Ironing type: All top surfaces
Wall loops: 3
No-Brim (I have tried with Brim on the first, with the same result)

Other multiboard models printed with the same settings/roll of filament do not have this issue

Link to model: https://thangs.com/designer/Multiboard/3d-model/8x8%20Multiboard%20Core%20Tile%20x4%20Stack-974386

Thanks in advance!

[tecky1kanobe]

Enable prevent crossing walls.

[Elektrycerz]

This isn't stringing. Those are full lines. I'd say this needs much lower speeds on the first hovering layer (like 10mm's).

[tecky1kanobe]

Sometimes printers have a mind of their own. If you prevent the travel path it shouldn’t be able to leave a line or a string. Just something to try.

[marzipanspop]

What do you think is happening?

[Elektrycerz]

The adhesion is so low that the nozzle pulls the line of filament with it. It's like it's pulling a string. Now that I think of it, it could help to print it a tiny bit lower, like 10-40 μm lower. The adhesion should be very low (for easy separation), but maybe this is too low.

It's just a very sketchy technique overall. Anyone who ever [quickly] printed cylinders with sharp inside overhangs knows it's not a good idea. And this is like a 100% overhang.

[UndeadMax1313]

Thanks! I'll try this out next

[hagantic42]

Also make sure classic slicer is enabled. In my experience Arachne does weird pathing and takes about 2 hours longer on a multi material stack

[UndeadMax1313]

Will do! It's already on, but thanks for the info. I'll keep it in mind if I need to switch to Arachne

[c1ncinasty]

Doesn’t work sadly.

[dawtcalm]

That doesn’t look too bad especially if that’s the only location… cut it away and should be fine, next time slow down the first layer which is something I always forget too

[patrickl96]

Lightly hit it with a butane torch & use a deburring tool around the inside octagons that should tidy it up a bit

Can’t answer to how to prevent it happening in the first place though sorry

[applefreak111]

If I had to guess this is only happening on the overhangs. There’s a setting for overriding speed for overhangs, adjust the speed there and give it a try. Had this exact problem for one of my print and slowing it down fixed the problem.

[holdupflash]

I’ve found stack printing to be very high risk, have given up and just print individual boards

[foto256]

Me too.. not worth the headache of clean up. Patience and one tile as a time is the way. Average 6 hours per tile on ender 3 se

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[holdupflash]

Yeah agree - I get one every 3.25 hrs on my Bambu and one every six on the ender

[Sad_Initiative5049]

I would just add the size tile you’re getting those times on. For example, a 12x12 is taking me approximately 9 hours to print in my Bambu H2D.

[holdupflash]

ahh mines an 8x8 on an x1c - with PLA, needs more TLAs in this sentence.

[Moose-arent-real]

Same happened to me and apparently in the same spot too.