Open edges when importing STL into Slicer Software

[pks5]

Hi,

when importing a STL created with the playground into my 3D printer's slicer software, i get warnings about open edges:

When i create the STL from the same model with the desktop version of OpenSCAD, this problem does not appear. Although it's not critical because the slicer repairs the errors, it's something that would be nice to be fixed.

Thank You for your great work!

Kind regards

[ochafik]

Ohh, been focusing on 3mf exports this week, did you only see issues with stl? Could you share a repro case? (Maybe in csg format to be self contained, can export on the desktop)

[pks5]

I created 3 files, all exported from machineblocks/examples/classic/brick-4x2.scad from repository MachineBlocks

Steps to reproduce:

1. Clone MachineBlocks Repo
2. Open examples/classic/brick-4x2.scad in OpenSCAD Desktop
3. Export as STL
4. now open the same file via MachineBlocks.com
5. Export as STL
6. Open both files in a Slicer, e.g. Prusa Slicer, and pay attention to warnings during import

Example files in ZIP archive:

brick-4x2-playground.stl was exported using playground
brick-4x2-desktop.stl and brick-4x2-desktop.csg were exported using desktop OpenSCAD

brick-4x2.zip

[pks5]

I just tried your latest version with 3mf export, and 3mf works fine for almost all scad models from the MachineBlocks library. No open edges when importing to Prusa Slicer.

An exception is the model "machineblocks/examples/boxes/box-6x6.scad", which also produces open edges when exported as 3MF from playground.

I tested box-6x6.scad also with OpenSCAD desktop and it works fine for both STL and 3MF