Fixing Your Model?

Discussion in 'General Discussion' started by LoveAndShapes, Nov 7, 2018.

  1. LoveAndShapes
    LoveAndShapes Well-Known Member
    When uploading a model, I now see the message: "fixing model".
    What is this, I DON'T want anything fixed in my model, if it needs fixing, I will do it myself.

    Regards, Robert
     
  2. MitchellJetten
    MitchellJetten Shapeways Employee CS Team
    We have always fixed models upon uploading, this isn't new :)
    And this is required for a model to be printable.

    Let's take this model from your shop as example:
    https://www.shapeways.com/product/CQQ94HN6R/tree-of-life?optionId=65172834
    upload_2018-11-7_12-36-23.png
    The original upload contains 24 shells, however since the model is supposed to be 1 part, we need to unify all the shells to make it printable

    upload_2018-11-7_12-37-37.png


    Once you upload the model we unify all shells into 1 shell per part.
    Below is a picture of the fixed version:
    upload_2018-11-7_12-38-49.png
     
  3. reducedAircraftFactory
    reducedAircraftFactory Well-Known Member
    There is a big difference between, "reformatting the data to better fit what our printer needs" and "adjusting the geometry of your model in unknown ways". Like Robert, I was worried that it was invoking thickness-fixing and other tools on my behalf, when I would rather adjust such things myself after looking at the 3D tools.
     
  4. stonysmith
    stonysmith Well-Known Member Moderator
    The "fixing" they are talking about here is named MeshMedic,
    1) Weld any overlapping shells together into single "convex" shells
    2) Removes any internal geometry that would otherwise create voids
    3) Remove tiny unconnected shells that are too small for the printer to print.

    MeshMedic was developed in concert with the Netfabb company has been in place for 9+ years. It is not "thickness repair".

    If you want to limit the effects of MeshMedic, then you can run your model thru Netfabb Public https://tools3d.azurewebsites.net/ which is fundamentally the same tool as MeshMedic, but you get to review the output yourself before uploading to Shapeways. I use it for 90% of my models.

    PS: welding the shells together prevents them from counting separately for part and volume calculations.
     
    aliciafelber likes this.
  5. reducedAircraftFactory
    reducedAircraftFactory Well-Known Member
    Perhaps there is a better word to use than "fixing"? "Fixing" implies there was something wrong with the initial model.