(Possibly related to #227 and #149, but perhaps this will provide additional clues to the core of the issue?)
Version
PrusaSlicer 2.0.0 - 201905201652
Operating system type + version
MacOS 10.12.6
3D printer brand / version + firmware version (if known)
Original Prusa i3 MK3S, latest firmware
Behavior
I designed a part in Fusion 360. It consists of the primary body and additional bodies which are custom supports. These are pretty thin (0.405 mm) so I have to enable "Detect thin walls" in the Print settings. When I merge the bodies together into a single part before exporting to STL, it slices fine in PrusaSlicer and prints beautifully.
If I export the separate bodies as a single STL from F360, it loads perfectly fine into PrusaSlicer and displays perfectly in the Platter view (see 1st screengrab). However, when I slice it, some tiny (but important) fragments of just 3 of 20 of the custom support bodies are just missing, even though their construction is identical to the remaining 17. (see 2nd and 3rd screengrabs).
I have also tried the "Repair STL file..." in PrusaSlicer. It claims to have fixed the STL (saved as an Obj), but it makes zero difference. Obviously, the workaround is to export everything as a single body from Fusion 360, but it is not ideal.
Interestingly, slicing only the custom support bodies with the same settings does not exhibit any slicing errors.
Expected Results
I was expecting no difference between exporting as a single body, vs. as separate bodies before slicing.
Actual Results
Inexplicable bits are missing from the sliced part if the STL was exported from multiple bodies from F360.
Screenshots from PrusaSlicer preview are preferred
Model in the Platter view
Sliced model in the Slice view
Layers above the affected area removed to better show the issue
Slicing only the custom supports with the same settings does not exhibit the same issue
(Possibly related to #227 and #149, but perhaps this will provide additional clues to the core of the issue?)
Version
PrusaSlicer 2.0.0 - 201905201652
Operating system type + version
MacOS 10.12.6
3D printer brand / version + firmware version (if known)
Original Prusa i3 MK3S, latest firmware
Behavior
I designed a part in Fusion 360. It consists of the primary body and additional bodies which are custom supports. These are pretty thin (0.405 mm) so I have to enable "Detect thin walls" in the Print settings. When I merge the bodies together into a single part before exporting to STL, it slices fine in PrusaSlicer and prints beautifully.
If I export the separate bodies as a single STL from F360, it loads perfectly fine into PrusaSlicer and displays perfectly in the Platter view (see 1st screengrab). However, when I slice it, some tiny (but important) fragments of just 3 of 20 of the custom support bodies are just missing, even though their construction is identical to the remaining 17. (see 2nd and 3rd screengrabs).
I have also tried the "Repair STL file..." in PrusaSlicer. It claims to have fixed the STL (saved as an Obj), but it makes zero difference. Obviously, the workaround is to export everything as a single body from Fusion 360, but it is not ideal.
Interestingly, slicing only the custom support bodies with the same settings does not exhibit any slicing errors.
I was expecting no difference between exporting as a single body, vs. as separate bodies before slicing.
Inexplicable bits are missing from the sliced part if the STL was exported from multiple bodies from F360.
Is this a new feature request? No.
Project File (.3MF) where problem occurs
The 3MF file and the single body STL file can be found here: https://www.prusaprinters.org/prints/3873-gopro-hero-7-cozy.
The multi-body STL file is here for your inspection: Mount w:Separate Supports.stl.zip