Slic3r filling in nut traps March 12, 2015 04:56AM |
Registered: 9 years ago Posts: 254 |
Re: Slic3r filling in nut traps March 12, 2015 08:16AM |
Registered: 9 years ago Posts: 351 |
Re: Slic3r filling in nut traps March 12, 2015 09:31AM |
Registered: 10 years ago Posts: 2,472 |
Re: Slic3r filling in nut traps March 12, 2015 07:43PM |
Registered: 9 years ago Posts: 254 |
The new version of Slic3r has an X/Y compensation setting that helps to adjust for things like undersized holes. I have not found a similar feature in Cura that does not involve resizing the entire part. So with Slic3r I have been able to get my other nut traps to come out on size (not counting the filled-in one), while with Cura I get undersized holes. I have my X/Y comp set at -0.15 in Slic3r.Quote
dmould
I agree that the STL probably needs repair. I am puzzled as to why Cura should produce dimensional inaccuracies - AFAIAA it should create exactly the same perimeter positions as Slic3r.
Dave
Re: Slic3r filling in nut traps March 13, 2015 08:19AM |
Registered: 10 years ago Posts: 2,472 |
Quote
Rich K.
The new version of Slic3r has an X/Y compensation setting that helps to adjust for things like undersized holes. I have not found a similar feature in Cura that does not involve resizing the entire part. So with Slic3r I have been able to get my other nut traps to come out on size (not counting the filled-in one), while with Cura I get undersized holes. I have my X/Y comp set at -0.15 in Slic3r.Quote
dmould
I agree that the STL probably needs repair. I am puzzled as to why Cura should produce dimensional inaccuracies - AFAIAA it should create exactly the same perimeter positions as Slic3r.
Dave
Re: Slic3r filling in nut traps March 26, 2015 08:39AM |
Registered: 11 years ago Posts: 369 |
Re: Slic3r filling in nut traps March 26, 2015 08:49AM |
Registered: 10 years ago Posts: 2,472 |
Quote
QuackingPlums
The new Mendel90 x-ends have the z-screw nut traps at the top instead of the bottom. If you think about how the plastic is laid down (in particular the order of perimeters and infill) then you'll realise that you cannot have a floating nut-trap. Nophead gets around this by putting a single-layer membrane at the base of the nut trap on which to build the rest of it - this is easy to remove afterwards.
Unfortunately, I remember reading that OpenSCAD gets the surface normals the wrong way round when exporting what is essentially an enclosed cavity, and Slic3r doesn't understand what this is so it just fills it in. Not very helpful, but that's the reason why.
Nophead uses Skeinforge to slice these models which is more resilient than Slic3r and has better dimensional accuracy than Cura.
Re: Slic3r filling in nut traps March 26, 2015 09:35AM |
Registered: 11 years ago Posts: 369 |
Quote
dmould
OpenScad has recently released a new version that I believe fixes that bug (but I have not tested it). It was fairly easy to workaround - just put a small (0.01mm) hole in the design from the outside into the cavity (e.g. through the membrane) and the STL will be correct - albeit with a small hole that Slic3r should ignore (being too small to print).
Dave
Re: Slic3r filling in nut traps March 26, 2015 01:47PM |
Registered: 10 years ago Posts: 2,472 |
Quote
QuackingPlums
Quote
dmould
OpenScad has recently released a new version that I believe fixes that bug (but I have not tested it). It was fairly easy to workaround - just put a small (0.01mm) hole in the design from the outside into the cavity (e.g. through the membrane) and the STL will be correct - albeit with a small hole that Slic3r should ignore (being too small to print).
Dave
Thanks Dave, I was about to go check on the status of that myself. Did the small hole trick actually work? I'd read about it but I was also waiting on something else from Slic3r before upgrading both parts of my workflow. Maybe now is the time to start producing my own spares, given that the printer has been going for over two years now.
Re: Slic3r filling in nut traps March 26, 2015 03:33PM |
Registered: 9 years ago Posts: 52 |
Re: Slic3r filling in nut traps March 26, 2015 05:41PM |
Registered: 9 years ago Posts: 254 |
Quote
dmould
Quote
QuackingPlums
The new Mendel90 x-ends have the z-screw nut traps at the top instead of the bottom. If you think about how the plastic is laid down (in particular the order of perimeters and infill) then you'll realise that you cannot have a floating nut-trap. Nophead gets around this by putting a single-layer membrane at the base of the nut trap on which to build the rest of it - this is easy to remove afterwards.
Unfortunately, I remember reading that OpenSCAD gets the surface normals the wrong way round when exporting what is essentially an enclosed cavity, and Slic3r doesn't understand what this is so it just fills it in. Not very helpful, but that's the reason why.
Nophead uses Skeinforge to slice these models which is more resilient than Slic3r and has better dimensional accuracy than Cura.
OpenScad has recently released a new version that I believe fixes that bug (but I have not tested it). It was fairly easy to workaround - just put a small (0.01mm) hole in the design from the outside into the cavity (e.g. through the membrane) and the STL will be correct - albeit with a small hole that Slic3r should ignore (being too small to print).
Dave
Re: Slic3r filling in nut traps March 27, 2015 10:01AM |
Registered: 10 years ago Posts: 2,472 |
Quote
Rich K.
That would be wonderful if I knew how to use OpenSCAD. I haven't found ANY free CAD software that is user-friendly enough for me to figure out yet, though, including 123D Design, Freecad, NetFabb Basic, Librecad, or Inkscape. The lack of a decent GUI that shows me what I am doing as I do it, and the use of Python scripts, puts OpenSCAD beyond me. I'm one of those people who needs an actual instructor looking over my shoulder teaching me how to use software if it isn't intuitive and user-friendly right off the bat (which is also why I only use Cura and Slic3r...)
Re: Slic3r filling in nut traps March 31, 2015 08:55AM |
Registered: 9 years ago Posts: 11 |