Bambu/Orca Slicers - Ya gotta fix this bug! Splitting STL files with holes become solid parts!

When you import an STL into orca or bambu studio, and the part has open cavities/spaces, which you designed to be that way, and you SPLIT the STL to parts, the STL is split so that all open spaces are converted into PARTS/Physical objects! For all those holy 3D gods, fix this bug!
PS: I mention some workarounds, if you want to use the modifier method, you can, but then i recommend making that part print as 100% solid for the height of where the holes are with 100% infill, you can split a part in fusion 360 using a face and then split the part in Bambu/orca slicer and select that part to be printed with 100% infill, and then use the modifier on it to maintain wall and top and bottom layers.
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[@astorMorisson]

I think the "bug" is actually in Autodesk because it puts the holes into a different solids in the stl. Unfortunately, STL does not really support this notion of assemblies except for non standard extensions. So there is no way to know if a solid in the STL denotes a hole or an object that overlays another object. Maybe you can export it as a 3mf or already split in Autodesk. Or you could try to make an assembly in Autodesk and load a step file. Maybe that improves the behaviour.

[@Toffypops]

it is not in autodesk since if you slice the stl without splitting it to parts i treats the holes as open spaces when sliced. When you split to parts it happens

[@astorMorisson]

@@Toffypops But this is the problem of STLs. They don't contain information about volumes. They only contain surfaces made of triangles. With that option you tell the program if the STL contains a single volume with holes or multiple bodies without holes. You cannot have both at the same time with an STL.

[@Satanika9]

so you split to parts, and the holes become parts; if you slice at this point the holes are filled parts, correct? what happens if you right click a part that should be a hole, and then >change type >negative part -- then slice? is there a difference from slicing the whole object not split into parts? note though that the hole(s) will only appear AFTER slicing, not in the prepare view, they should still be there though

[@Satanika9]

ok i think i understand better now, so you cannot paint support blockers inside the model after splitting to parts? here are some other suggestions for workarounds -- enable supports on build plate only, and then either -- paint ON where you want the supports on the inner lip to be -- or since it seems your object is hollow at the bottom try tree supports. another solution is split to parts>change hole parts to negative part, then copy paste the hole parts, for these new hole parts change type>support blocker, select these blocker holes again and scale to e.g. 105%. a better description of the bug is probably that it seems impossible to paint supports/support blockers on negative parts, though it may be considered a missing feature, not a bug

[@Toffypops]

This is definately a bug. The main problem here is that since these parts are inside..setting supports to baseplate only will not work. It will still make supports. If you use the negative part way, it will not correctly print the walls, top and bottom of the holes. This is a bug since a slicer should ignore open holes all together so people can paint support blockers. I do not want to use % to increase the size of the holes as the magnets may get dragged out of the holes due to them being attracted to the nozzle. If the part is exported using the 3d print feature in fusion 360 it does not generate objects from empty spaces. But it will only print 1 object at a time So basically it is the split-to-parts feature that is bugged. It should ignore open spaces inside the model. The only alternative I found was to make cuts in fusion above and below holes and then select those parts as 100% infill and then import an stl of the holes and select them as negative modifiers...That would leaves walls intact but still not make it possible to paint support blockers. This problem when splitting to parts is so unneccessary it should be fixed. Many thanks for comments and feedback. 😊

[@Satanika9]

@@Toffypops well... sorry if this gets complicated :) 1. in the exported file the 'holes' ARE objects/parts, meaning they have their own independent geometry, just inside geometry of another part 1b. possible bug/missing feature would be that the "hole" parts are not set to type "negative part" automatically 2. if you do split to parts, then select a hole and change type for that to negative part, then slice, are you saying that outside the hole there are no walls? i cannot replicate that, or i do not understand. i do not see a difference between a non-split object with holes and a split object with hole parts set to negative parts -- after slicing. 3. i did not suggest to increase the hole size -- the suggestion is to set hole parts as negative parts, then copy/paste them, and these new copies should be set to type "support blocker" - to make sure they block supports they may need to be increased a few% - this does not increase the hole size 4. there is a difference between split to parts and split to objects, all of this is only applicable when using split to parts 5. i do not understand the line "if the part is exported.." 6. if you have a negative part inside another part and have supports on baseplate only, there should be NO supports inside the negative part. are you saying there are?

[@Toffypops]

if you export a part to an stl-file and then bring it into orca and split it to parts, each part keep their relative places in the geometry. If you split to objects, everything is places on the buildplate which is not what you would want. I understand the split to part makes objects out of empty spaces, but this does not happen when i use the 3D PRINT feature in Fusion 360, then the object comes out with holes correctly. Although you cannot print several holes at the same time. I tried to set the holes as objects to negative parts, and all i end up with is infill missing the objects without walls going around it. And if you set supports on baseplate only, it will still put supports on objects where they have overhanging walls inside another object. It does not work for open spaces inside the model itself. I actually did not see that you had an "add support blocker" feature. Still learning . That might work as you say if you expand it to "paint" the support areas. Thnx for commenting. :)

[@Satanika9]

@@Toffypops this would be easier if i could post an image, but let me try to describe the settings as precisely as possible 1. under global>support, "enable support" should have a filled green box with checkmark; "on build plate only" should have a filled green box/checkmark; near the bottom under advanced "don't support bridges" should have a filled green box/checkmark 2. hole parts in the split object should be set to type "negative part", not modifier or anything else. negative parts have a small green circle with a minus symbol to the left of their name 3. under global>quality>overhangs "make overhangs printable" should NOT be checked, it should just be a white empty box if you slice with these settings exactly, you should NOT be getting any supports inside the holes/negative parts, but hopefully there should be walls