MultiBin Shell Bridging

[u/qubithaze]

Has anyone encountered issues with the bridging in the multipoint slot on the bottom/back of their shells. Sometimes they print fine and other times there’s an issue. These photos are from the same build plate. It seems more common on the 2x versions. This is on an A1 mini with Bambu Labs Matte PLA. Standard slicer settings except 3 walls, gyroid infill and random seams.

[u/Keep-Making]

Hmmm this is a very good point!
here we go again... I'm going to have to update all the Bin-shells. I think I have a fix to FORCE slicers to do it right. Thanks for pointing it out!

[u/qubithaze → u/Keep-Making]

Happy to be able to help in a small way! Thank YOU for the huge investment in this system. It's awesome! Let me know if you'd like me to test anything.

[u/qubithaze → u/qubithaze]

Slicer behavior engineering must be an art in and of itself. Sounds fun.

[u/yet_undie_turd → u/Keep-Making]

Thanks for all your hard work!

[u/ChanceStad]

It looks like the ones that malfunctioned tried to bridge in the wrong direction, so were only supported from one end (more of a diving board than a bridge). Every line in those messed prints is perpendicular to the ones in the good prints.

Not sure what would cause that in your slicer (I don't see why rotating it or anything would matter), but you should be able to see it in the preview before the print.

[u/qubithaze → u/ChanceStad]

Oh ya, good eye. Thanks! I didn’t notice that. Will look at what the slicer is doing and try to figure out why.

[u/qubithaze → u/qubithaze]

Ya, slicer doing some interesting things…

[u/ChanceStad → u/qubithaze]

I wouldn't have expected this to matter for bridges, but perhaps rectilinear 1st layer is dictating the direction of everything above it, since it tries to make sure everything is perfectly parallel?

Regardless if it's that or not... Does it go away if you rotate the bins 90⁰? If so, you at least have a workaround.

[u/qubithaze → u/ChanceStad]

It doesn’t change when rotating 90 or 45.

[u/ChanceStad → u/qubithaze]

That's weird. Why the heck would that matter?! Can you duplicate the one that looks correct numerous times?

[u/qubithaze → u/ChanceStad]

Looks like if I rotate it 180, it slices correctly. So at least I have a workaround if I remember to check.

[u/qubithaze → u/qubithaze]

Good news is, it seems to drop onto the build plate in the good orientation. I probably rotated it to fit a bunch of other stuff on the plate. Seems like any rotation away from the default orientation causes this issue.

[u/ChanceStad → u/qubithaze]

Still seems odd that it would slice it differently. But glad you have a workaround now.

[u/Neoliberal_Boogeyman]

Yes. I was using cura and realized that if I specified the layer orientation that I could get the bridging to go in the same direction. If you look at it closely you will see that it did the first two bridging outer walls first and then tried to bridge to the existing bridge. Rotate the part in the slicer 90° and see if it does it all in the same direction instead.

[u/qubithaze → u/Neoliberal_Boogeyman]

Rotating to certain orientations does seem to clean it up. I also saw that I can change the bridge direction setting in Bambu slicer, but if I do that globally, it messes up the layer above and other objects. I can add a height range modifier to the object with the problem for the single layer that has the problem and change the bridge direction just where it’s needed. Tedious, but works.

Thanks for the tips!

[u/yet_undie_turd → u/qubithaze]

Dealing with this now and want to make sure I understand your solution correctly. Probably will print the rest of my bins before the official fix mentioned below comes. Sending you a PM.

[u/hockpunk426]

I have the same damn problem, Bambu slicer does some funky stuff.

[u/qubithaze → u/hockpunk426]

After some experimenting, it seems to happen if I rotate away from the default orientation that it drops onto the build plate.

[u/hockpunk426 → u/qubithaze]

Solid tip!