Red Hat Bugzilla – Bug 1308365
slic3r crashes when loading known good stl files
Last modified: 2016-12-20 13:44:03 EST
Created attachment 1127097 [details]
This is an stl file that slic3r is having trouble with. It is an sd card holder
Description of problem:
slic3r loads a known good stl file, announces that it is too large and was automatically scaled down to fit your print bed, on saying 'ok' slic3r closes completely.
The file is 'known good' as it loads into the slic3r in Fedora 22 with no problem (not too large)
I ran from terminal with these results:
[jduchek@localhost ~]$ slic3r
Warning: File size doesn't match number of facets in the header
Caught C++ exception of unknown type at /usr/share/perl5/vendor_perl/Slic3r/GUI/Plater.pm line 1791.
Version-Release number of selected component (if applicable):
always on the files it decides are too large. Some files still load properly.
Steps to Reproduce:
2.add affected file (stl)
3.say ok, when it tells you it has fixed the file.
Actual results: slic3r closes so you have to start over
Expected results: display the loaded file.
Additional info: I have attached an affected stl file
I can reproduce this.
Netfabb basic says this is an invalid STL file.
ADMeshGUI silently loads the file but displays nothing.
ADMesh for command line produces the following output:
================= Results produced by ADMesh version 0.98.2 ================
Input file : sd-organizer-style.stl
File type : Binary STL file
Header : ��������������������������������������������������������������������������������
============== Size ==============
Min X = -0.000000, Max X = 31139554425569280.000000
Min Y = -4.787809, Max Y = 216341.203125
Min Z = -0.000000, Max Z = 847403352064.000000
========= Facet Status ========== Original ============ Final ====
Number of facets : 608 664
Facets with 1 disconnected edge : 67 0
Facets with 2 disconnected edges : 36 0
Facets with 3 disconnected edges : 12 0
Total disconnected facets : 115 0
=== Processing Statistics === ===== Other Statistics =====
Number of parts : 27 Volume : 2236782408995176448.000000
Degenerate facets : 19
Edges fixed : 0
Facets removed : 31
Facets added : 87
Facets reversed : 761
Backwards edges : 0
hexdump of a normal binary STL file looks like:
0000000 4f43 4f4c 3d52 0000 0000 0000 0000 0000
0000010 0000 0000 0000 0000 0000 0000 0000 0000
0000050 f06c 0000 0000 0000 0000 0000 0000 bf80
First 80 bytes are header (null terminated). Next 4 bytes are number of facets.
hexdump of your file looks like:
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
0000400 454d 4853 4d2d 5345 2d48 454d 4853 4d2d
As you can see a lot of first bytes are replaced with 0xFF. If your header is not supposed to be nonprintable garbage and number of your facets isn't max of UINT32, which the file size doesn't indicate, something is wrong with your file.
Slic3r should not crash about it. I've tested with binary from slic3r.org and also got crash (although the output in terminal is slightly different). Could you please go and report this upstream, if you think Slic3r should display a decent error message?
I passed all the information here to slic3r.org. I have found several files that 'used to work' exhibiting this problem. I am at a loss to see how the header could be garbage as I haven't changed them after downloading them. Must of done something. Anyway, thank you for the analysis and suggestions.
For the reference: https://github.com/alexrj/Slic3r/issues/3238
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