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What S3D Sees Before and After

PostPosted: Wed Jan 31, 2018 6:17 pm
by Phil
I have been printing stuff through 3DHubs. Occasionally, I get files that look totally different once sliced by S3D. Does anyone know why this happens?

I tried to upload screenshots saved in PowerPoint, but they do not seem to be visible.(?)

Re: What S3D Sees Before and After

PostPosted: Wed Jan 31, 2018 8:02 pm
by ednisley
"Powerpoint" isn't an image file format, it's a Microsoft presentation program. You can upload screenshots / images saved in JPG or PNG format.

Even without seeing the files, I'd lay long odds that the STL files aren't manifold, which means they're not closed surfaces. Different slicers (try to) perform automatic repairs in different ways, but the results generally differ from the original objects, sometimes in hilarious ways.

As a rule of thumb, you should (ideally) figure out how to create models that produce valid STL files or (if possible) manually repair the broken files before attempting to slice them.

Re: What S3D Sees Before and After

PostPosted: Wed Jan 31, 2018 8:45 pm
by insta
And, not to be a huge dick about it, but ... like ... fixing non-manifold files is 3d print operator 101. You really should have that long under control before printing for other people.

Re: What S3D Sees Before and After

PostPosted: Wed Jan 31, 2018 10:58 pm
by Phil
101? I guess I was allowed to skip that class. Seven years printing with four different printers, and this was the first time I had seen this. I have used SolidWorks since 2001; not much experience with crappy, online CAD software.

Re: What S3D Sees Before and After

PostPosted: Thu Feb 01, 2018 1:06 am
by ednisley
Phil wrote:the first time I had seen this


Well, everybody has a first time for everything. Welcome to the club ... [grin]

Upload those images; it'll be interesting to see what's actually happening!

You should run the G-Code through a previewer along the lines of http://gcode.ws/ to make sure the actual machine motions match the original design, the STL file, and your expectations.

Re: What S3D Sees Before and After

PostPosted: Thu Feb 01, 2018 1:16 am
by insta
Phil wrote:101? I guess I was allowed to skip that class. Seven years printing with four different printers, and this was the first time I had seen this. I have used SolidWorks since 2001; not much experience with crappy, online CAD software.


You can skip it when you're making your own files, using competent software :)