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cannot pull face

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15 commentaires

  • Henk niet

    When I cut the object in pieces and extrude the it goes well nill I get to the point where the lozenge connect to the circel, there it goes wrong. At the top point dsm made a extra face which i cannot delete, at the second bottom point I cant extract also but I cant find anything wrong.

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  • Tim Heeney

    Hi Henk.

    Take a look at this.

    ' https://youtu.be/cBLAvBtisbA '

    It might help...basically it's a simple way to remove ' troublesome geometry' - it has helped me greatly - it's worth a try :)

    Also, in Options> Advanced > Behavour > Enable Geometry Convergence - i turn this off . If 'On', you might wonder why a 3mm fillet becomes 2.85698122 ! If set to 'Off', it will not allow a 3mm fillet ( nor any fillet) to me generated. If 'On', it's possible you might not notice the auto correction.

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  • Tim Heeney

    Henk.

     

    All those cuts ??

    The first post showing a 'single closed surface' didn't Pull into a solid - that right ?

    Division = partial success only - all those dividing lines have broken up the original shape and now, you cant make one solid.

    Henk, this is the wrong approach - i believe there was something wrong / odd with the original sketch geometry - that's all i can think it can be - sorry.

    BEAUTIFUL shape !

     

     

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  • Tim Heeney

    Henk.

    It's is vital to ensure good sketch geometry - small mistakes are all to easy...

     

    Generally, i don't keep changing the 'Snap Options' - instead, i watch like a hawk whats being snapped to - sometimes important to turn grid on/off as you proceed .though.

    'Ctrl middle mouse revolve' to cycle through all local possible 'connections' - also highlights item in curve folder. If all 'coincident' , it might not be necessary to do this!

    Also, if geometry is getting to cluttered or confusing, try hiding entities - select it, Ctrl h ( to hide ) , Alt h ( to hide all others), Ctrl Shift h to show all - or turn them on/off in structure tree ( very slow imo).

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  • Henk niet

    Yep Tim , I can only agree with you, probably its in the sketching where I go wrong but I have no clue where. I tried it several times and it happens again and again.
    If nobody has reported this before it must be me messing things up.

    I will try it again.

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  • Jacant

    When you try to 'Pull' the surface, there are 'shared' edges that are making the shape non manifold. There needs to be a gap where the lines meet.

    It would be impossible to join the two cubes, as they are sharing an edge.

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  • Jacant

    You may find this link informative, when you come to save your file as an STL.

    https://www.additive.blog/what-to-know-about-3d-data-stl-file-3mf/ 

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  • Tim Heeney

    Jacant - thank you- very usefull information.

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  • Tim Heeney

    Henk.

    Jacant is totally correct about shared edges.

    The below picture highlights what can happen with overlapping ( very small or very big) closed regions - perhaps you know this so apologies in advance.

    Hope this helps - i still have to be very carefull with snaps etc, and i constantly watch the structure tree and especially the task bar selection entity info. It does become second nature after a while...

     

     

     

     

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  • Henk niet

    Jacant

    The sharing edges where the problem, it made my object indeed non manifold.
    I have cut those 2 pieces out and repaired them and the problem was solved.

    Verry nice article about stl and 3mf. Specially the part about the manifolds and
    overlapping solids, didnt know that this was so tricky,

     

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  • Jacant

    ...Specially the part about the manifolds and
    overlapping solids, didnt know that this was so tricky,..

    With DSM being a solid modeller you should not really have a problem, except on shared edges. Whereas Sketchup is a 'Mesh' designed program so each Part you make will be just faces with an inside and an outside. So any overlapping meshes will have unwanted internal geometry.

    Just make sure you have one solid in an STL file

    Saying that an STL file is an approximation of the 'outside faces' of your model, with each face split up into triangles. Even a circle or curve will be split into segments So the the more triangles you have the smoother the model.

    Check this link.

    https://designspark.zendesk.com/hc/en-us/community/posts/115000087525-3D-Prints-are-not-round- 

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  • Henk niet

    Jacant
    I have tried to do your project about pulling text, https://www.deviantart.com/jacantdesign/art/TEXT-Key-Fob-438718419

    and the first try I did was a faillure. It is not possible to pull the letter 1. Did a new try following https://www.youtube.com/watch?v=RDmoN207CjA and again faillure. Lettertype Albertus Extra Bold, size 7.
    I did it again with a few other lettertypes and then it wend well.
    Why are these things only happen to me.

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  • Jacant

    I first published that in 2014. The YouTube version was uploaded in 2017.

    It all depends on the font you use. Certain fonts will have the curved corners missing, there may also be gaps, Either close the gaps or use a different font.

    If ever you see lines that have not been converted into a 'surface' then there will be gaps somewhere along the periphery.

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  • Tim Heeney

    Henk...

    You said ' Why are these things only happen to me.'

    I reckon they don't only happen to you Henk...but that aside, every failure overcome, builds experience and confidence.

     

     

     

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  • Henk niet

    Indeed Jacant
    Here it is, the lines are not closed. I think thats why printers dont use ttf but instead PostScript, I will ask them.

    Because I do a lot with letters and special pre 16th century Incunabel technic I have more then 800 different kinds of fonts on my computer and some of them I have made myself, made from books from the early ages, what are the odds that I pick out all of them a font for a first excersi that is not watertight, really, when I would tell Einstein that perhaps he will start to believe in miracles.

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